Formerly the LLAMA Public Relations and Marketing Section, the LLAMA Marketing and Communications Community of Practice pulls together people in marketing and communications from public, special, and academic libraries. Its committees run the John Cotton Dana Library Public Relations Award and the PR Xchange, which showcase the best public relations work done in libraries. The Flickr stream for the PR Xchange is a great place to see examples of excellent library marketing materials.
Libraries & Social Media is "a public group for anyone working professionally in social media for their library, local government, or nonprofit organization."
Programming Librarian Interest Group"helps librarians advocate for programming at their own institutions, share program ideas and successful strategies, and provides a space for professional development by librarians who do programming officially and unofficially as part of their job duties. The group is also be a vehicle for ALA members to connect more dynamically with ALA’s Public Programming Office."