Hakim El Hattab (hakim.se), a very talented developer and programmer, has created a set of awesome scrolling effects with CSS.
The effects are all CSS-only and a simple JavaScript function helps attaching/removing classes to elements.
Currently, there are 10+ effects and, as expected, they are WebKit + Firefox-only but degrade nicely on incompatible browsers.

You should also check the experiments page of hakim.se to see various other exciting stuff.
Compatibility: WebKit & Firefox
Website:http://lab.hakim.se/scroll-effects/
Download:https://github.com/hakimel/scroll-effects
via webresourcesdepot.com