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. Rounded Corners
2. Rounded Corners without images
3. Creating a Netflix style star ratings
4. Tableless forms
5. Styling Lists with CSS
6. 2 Column Layout Technique
7. 3 Column Layout with CSS
8. 3 Column Fixed width centered layout
9. Printing with CSS
10. Adding a CSS stylesheet to an RSS feed
11. Footer Stick
12. CSS Element Hover Effect
13. Styling Horizontal Rules
14. Clearing Floats
15. CSS Popups
16. Box Punch
17. CSS Badge
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.