There are several mailing lists dealing with patterns.
Information about how to subscribe to each can be found below. 

patterns@cs.uiuc.edu is for presenting and describing software patterns.
business-patterns@cs.uiuc.edu is for presenting and describing business patterns.
ipc-patterns@cs.uiuc.edu concerns patterns on concurrency, distribution, and IPCs.
dacm-patterns@cs.uiuc.edu is about decoupling & complexity management.
patterns-discussion@cs.uiuc.edu is for discussion of patterns in general.
gang-of-4-patterns@cs.uiuc.edu is about the design patterns in the Gang of Four's book.
siemens-patterns@cs.uiuc.edu is about the patterns described by the Siemens guys.
organization-patterns@cs.uiuc.edu is for discussing patterns involving organizations.
corba-patterns@cs.uiuc.edu is about patterns described in CORBA Design Patterns and related patterns.
pb-patterns@cs.uiuc.edu is for discussion Power Builder patterns.
antipatterns@cs.uiuc.edu concerns antipattern refactoring and the book AntiPatterns.
scm-patterns@cs.uiuc.edu is about patterns for software configuration management.
telecom-patterns@cs.uiuc.edu is about patterns for telecommunications

How to Subscribe to the Various Lists

If you have a browser that handles forms, there is a page for subscribing and unsubscribing directly.

patterns@cs.uiuc.edu is for presenting and describing software patterns. They don't have to be object-oriented or design patterns, though most of them are.

To subscribe, send a request to patterns-request@cs.uiuc.edu containing the word subscribe in the Subject: field. Don't say "please subscribe me" or "I want to subscribe" or anything else. Just use the one word "subscribe". If you want a human to read your mail, type "Re: <something>" in the subject. To unsubscribe, send a request to patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field. 

business-patterns@cs.uiuc.edu is for presenting and describing business patterns.

To subscribe, send a request to business-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. Don't say "please subscribe me" or "I want to subscribe" or anything else. Just use the one word "subscribe". If you want a human to read your mail, type "Re: <something>" in the Subject: field. To unsubscribe, send a request to business-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

ipc-patterns@cs.uiuc.edu is for presenting and creating patterns on concurrency, distribution, and IPCs.

To subscribe, send a request to ipc-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. Don't say "please subscribe me" or "I want to subscribe" or anything else. Just use the one word "subscribe". If you want a human to read your mail, type "Re: <something>" in the Subject: field. To unsubscribe, send a request to ipc-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

dacm-patterns@cs.uiuc.edu is for presenting and creating patterns about decoupling systems and managing complexity so that an architecture can be implemented in the context of organizational constraints. Of particular interest are:

• applications of "classic" patterns, like those in Design Patterns to the problem of designing an architecture to facilitate groups working together, and
• new patterns, perhaps combining GOF patterns, to achieve the same goal.

To subscribe, send a request to dacm-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. Don't say "please subscribe me" or "I want to subscribe" or anything else. Just use the one word "subscribe". If you want a human to read your mail, type "Re: <something>" in the Subject: field. To unsubscribe, send a request to dacm-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field. 

patterns-discussion@cs.uiuc.edu is for discussion of patterns in general, i.e., for discussing how to find patterns, how to organize them, or the meaning of patterns, but not necessarily about particular patterns.

To subscribe, send a request to patterns-discussion-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. Don't say "please subscribe me" or "I want to subscribe" or anything else. Just use the one word "subscribe". If you want a human to read your mail, type "Re: <something>" in the Subject: field. To unsubscribe, send a request to patterns-discussion-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field. 

gang-of-4-patterns@cs.uiuc.edu is about the design patterns in the Gang of Four's book Design Patterns: Elements of Reusable Object-Oriented Software.

To subscribe, send a request to gang-of-4-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. Don't say "please subscribe me" or "I want to subscribe" or anything else. Just use the one word "subscribe". If you want a human to read your mail, type "Re: <something>" in the Subject: field. To unsubscribe, send a request to gang-of-4-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

siemens-patterns@cs.uiuc.edu is for reviewing and discussing the patterns described in the forthcoming book Pattern-Oriented Software-Architecture - A System of Patterns.

To subscribe, send a request to siemens-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. To unsubscribe, send a request to siemens-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

organization-patterns@cs.uiuc.edu For discussing patterns involving organizations, and the interaction between organization and architecture.

To subscribe, send a request to organization-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. To unsubscribe, send a request to organization-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

corba-patterns@cs.uiuc.edu For discussing patterns described in the book CORBA Design Patterns and related patterns. CORBA-patterns@cs.uiuc.edu will also include presentation and discussion of Interface Definition Language (IDL) idioms from the Object Management Group's (OMG) IDL Metrics Working Group and new pattern languages sharing the same reference models (the book's Software Design Level Model and the OMG's Object Management Architecture).

To subscribe, send a request to corba-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. To unsubscribe, send a request to corba-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

pb-patterns@cs.uiuc.edu For discussing Power Builder patterns.

To subscribe, send a request to pb-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. To unsubscribe, send a request to pb-patterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

antipatterns@cs.uiuc.edu is a software development forum for the theory and practice of AntiPattern recognition and AntiPattern refactoring. AntiPatterns is a branch of design patterns research that documents negative solutions and their resolution through refactoring. Well known AntiPatterns include: Spagetti Code, Analysis Paralysis, and Stovepipe Systems. These and other AntiPatterns are documented in the book: W.J. Brown, H.W. McCormick, R.C. Malveau, and T.J. Mowbray, "ANTIPATTERNS: Refactoring Software, Architectures, and Projects in Crisis" , John Wiley & Sons, 1998. AntiPatterns research spans software design, software architecture, and software project issues, including both formal and informal refactoring techniques. The purpose of antipatterns@cs.uiuc.edu is to promote the general understanding of AntiPatterns and related extensions of design patterns research.

To subscribe, send a request to antipatterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. To unsubscribe, send a request to antipatterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

scm-patterns@cs.uiuc.edu is a list created for patterns of software configuration management.

To subscribe, send a request to scm-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. To unsubscribe, send a request to scm-antipatterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.

telecom-patterns@cs.uiuc.edu is a list created for patterns of telecommunications systems.

To subscribe, send a request to telecom-patterns-request@cs.uiuc.edu containing a single word subscribe in the Subject: field. To unsubscribe, send a request to telecom-antipatterns-request@cs.uiuc.edu containing a single word unsubscribe in the Subject: field.