The book "Java EE 5 Architekturen" is available from amazon.de - so is really out now :-).
The p4j5 community is still growing. Only last week I approved 3 observers - now we are 22. I get many direct questions and suggestions (some really interesting) directly per email regarding patterns, and architectures - please use the p4j5 forum/mailinglist for discussion as well.
NEW: Online Workhop Effective WebApps without Frameworks is also coming to: MUC Airport.