CSS Techniques Roundup - 20 CSS Tips and Tricks

I never cease to be amazed at what problems can be solved with pure CSS. Here are 20 CSS techniques, tips and tricks that you may find handy:

1. CSS Uppercase
2. Rounded Corners
3. Rounded Corners without images
4. Creating a Netflix style star ratings
5. Tableless forms
6. Styling Lists with CSS
7. 2 Column Layout Technique
8. 3 Column Layout with CSS
9. 3 Column Fixed width centered layout
10. Printing with CSS
11. Adding a CSS stylesheet to an RSS feed
12. Footer Stick
13. CSS Element Hover Effect
14. Styling Horizontal Rules
15. Clearing Floats
16. CSS Popups
17. Box Punch
18. Orange RSS Buttons with pure CSS
19. 10 CSS Tricks you may not know
20. 10 More CSS Tricks you may not know

Do you have other good tips tricks and techniques? Please post them in the comments.

Update: I have started working on a CSS Cheat Sheet that you may find handy.

Update Again: I removed several links that no longer work.