I am thrilled to announce that we (Spark::red) have just launched the ATG Developer Community!
It is a free, open, community portal for everyone who works with ATG software, developers, architects, project managers, business users, everyone. The site has a wiki for posting articles, your own pages and blog entries, how-tos, and more. There is also a number of forums for discussion and asking questions. We also offer free Subversion code hosting, and Jira issue tracking for open source ATG related projects and code development.
Please check it out, register, and tell us what we can add to make it more useful.