GameBoid is a highly polished Gameboy Advanced emulator for Android. GameBoid makes it easy for people who have a physical keyboard to set the game buttons to their liking and people without keyboards can use the onscreen controls. The paid version of GameBoid allows gamers to quickly save and load game states. Game was able to run every rom I loaded smoothly, only lagging when too many applications were open or right before receiving a phone call, text message or email. If you're a GBA fan GameBoid is well worth is $3.99 asking price.
http://www.youtube.com/watch?v=WjPbY0vZbJg