The question now why Android Birds is free when it's certainly a moneymaker potential stream for the developer? According to the developer:
"We want to make Angry Birds available for as many people as possible. Previously, many people were experiencing problems in finding Angry Birds on Android Market, but now everybody can download the game on their device."
Sure it's free but of course there are adds on the game, but it's fine, the game is great.
You can grab Angry Birds via Android market or head to m.getjar.com using your mobile browser. Or visit this link to download the app.