Brandon,
That's a great list. Lots of good info there. If I may, I have two to add...
#1
The Zen Garden . This really awakened me to to POWER of CSS. Click on the designs on the right side of the page, They will load up different CSS files using the same html file. Really cool.
#2
Webmaster World . This is a News and Discussion for the Independent Web Professional site. It is a great community forum like Chiefdelphi dedicated to web issues. It's free to register for the public side. There are forums dedicated to all web subjects including a terrific CSS forum. Post a question and someone will toss out an answer. There is a non-public side, that deals with the business side of the web that makes really interesting reading. It's good community, very much like we have here.
jb