Spritely: a jQuery plugin for animated sprites and backgrounds
http://www.spritely.net/
Flash? What's that??
Recreating the OS X Dock with CSS3 (including zooming icons!)
http://www.zurb.com/playground/osx-dock
This is pretty awesome, I can see all kinds of uses for it. It even does the dock zooming effect, purely in CSS3!
Correction: It uses a little bit of Javascript to add the "nearby" class to the neighboring icons when you mouse over. View source to see it.
Zooming Polaroid-style images with CSS3
http://www.zurb.com/playground/css3-polaroids
Neat little effect that's usually done in Flash for photographer portfolios and photo galleries. Not anymore!
Sliding Vinyl with CSS3
http://www.zurb.com/playground/sliding-vinyl
Nice little animated sliding effect using CSS3 animations. I saw one a little while ago that had the records spinning as they came out, but I can't seem to find it. If anyone knows where it's at, post it in the comments!
3D Coke Can in pure CSS
http://www.romancortes.com/blog/pure-css-coke-can/
This is freakin' awesome. A 3D Coke can that uses CSS to create a displacement map.
Falling Leaves with CSS3 animations
http://webkit.org/blog-files/leaves/index.html
Ok yes, it's a little bit 1996, but it is still NOT FLASH :)
Very cool HTML5/canvas demo. Wait a bit until the music starts for MAXIMUM AWESOME
http://9elements.com/io/projects/html5/canvas/
Runs a million times smoother than Flash.