A friend, TopSurf ask about some CSS sites, so I thought I'd put together as list of sites I've used/use to help out learning and coding CSS.
Learning CSS - a very nice comprehensive resource
Cascading Style Sheets and Dreamweaver CSS Reference Sites - another very nice comprehensive resource
CSS from the Ground Up
CSS Reference
CSS selectors
CSS Layout Techniques
Free CSS Templates
CSS Zen Garden
Site Reference Forum - HTML/CSS Help
Position is Everything - CSS Positioning / good info on what doesn't work in which browsers and More
There are many many more out there on web, hope this helps out
