Amazon has released their Android Appstore, and it's actually pretty decent. They have the Angry Birds Rio exclusive, and it's free for right now, so if you're into that, go grab it while you can.
They're also giving away a paid app a day. Today's is Doodle Jump, which actually is pretty fun and addicting.
Be warned, you must have an Amazon account with a CC attached, even for free apps. I assume most of the world has that, but if you don't, no bitching to me about it.