Online version (any browser):
http://chrome.angrybirds.com/ (http://chrome.angrybirds.com/)
Google Chrome version:
* Link no longer valid...
This is a fun game, been playing on my Android device and every once in a while on Google+ because on there you can compete against your plus buddies.
I've been playing it for quite awhile on my iPod Touch. I also have the Seasons and Rio versions. ;)