Here are some Web 2.0 Archiectural resources that I use a lot:

Newsfeeds worth following are: http://www.techcrunch.com/ and http://tech.memeorandum.com/.

blogs worth reading are:

http://radar.oreilly.com/archives/2005/10/web_20_compact_definition.html

http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-is-web-20.html

http://web2.wsj2.com/review_of_the_years_best_web_20_explanations.htm

http://web2.wsj2.com/is_web_20_the_global_soa.htm

http://web2.wsj2.com/the_best_web_20_software_of_2005.htm

OPML Web 2.0 Aggregator:

http://www.web20workgroup.com/

API’s, mashups etc:

http://programmableweb.com/