Angry Birds just launched on Android. It's free, but ad-supported. You have to go through getjar.com to grab it right now, but they'll be launching it on the Marketplace later.

If you have any problems with the download, let me know and I'll send you a link to my Dropbox. The website is suffering from massive amounts of downloads. Rovio's site went down, too.

I only get access to a trial version free.

Here, download it from my Dropbox:
http://dl.dropbox.com/u/589076/Angry%20Birds/AngryBirds_1.3.5.apk