I had this in my blog at work, but I thought I’d copy it here too….
General
CSS for Layout
A List Apart on how and why they switched to CSS: Part 1, Part 2, Part 3
CSS for Printable Pages
Kissing Print Versions of Pages Goodbye
Hiding CSS from Old or Buggy Browsers
Tricking Browsers (from Eric Meyer on CSS)
Summary of tricks and hacks to hide CSS
… and just for fun