I am not a huge fan of roundups, but this morning, I found that I have a few pretty popular CSS3 posts and decided to put them in a single post which will be updated whenever a new one appears and is worth seeing.
How to Create a Fully Functional CSS3-only Treeview
How to Create Semantically Correct Imageless Custom Checkboxes and Radiobuttons with CSS3
How to Style HTML Dropdowns with CSS3
Creating Crossbrowser CSS3 and SVG Reflections
How to Create iPhone Toggle Buttons with CSS3
How to Achieve Gaussian Blur Effect with CSS3
Just check this amazing presentation here.
How to Crop Background Sprite with CSS3