Some of you guys should hit up the Android BBQ. It's actually a big, sponsored event, but mostly the bad-ass developers we all follow on twitter.
Wish there was one in nc, or you guys were coming to the Eat Coast Game Conference (Raleigh, my wife is the pr person for it).
1) A donation just lets the recipient know that his or her work is appreciated, so in reality the amount is less important than the actual recognition and appreciation given.