I bought a Gametel bluetooth controller at the Gadget Show. It works with iOS and Android, and is compatible with iCade games.

The really cool thing is you can clip your iPhone in and you get a game console with buttons! Perfect for some games.

You can find out more here:

http://gametel.se/

I'll be updating Neon Invaders, Stick Man vs Zombies, and my forthcoming platform game (currently called Gumbo's big adventure) to work with it.