WordPress CMS discussion and tools at the WordPress Codex site
Bloghelper's Using WordPress as a CMS articles
A response on BloggingPro.com with lots of comments
"Beyond Blogging: WordPress as CMS" at CMSWire.com
"Five WordPress Plugins that Turn WordPress into a CMS" at Ann Arbor Web Design
Joe Brockmeier's "Must-Have WordPress Plugins"
Gobala Krishnan on WordPress CMS applications like training courses and classified ads
BaoCMS: A CMS plugin for WordPress
A CMS theme from Bos89.nl