Joerg Jahnke has released an updated version of JMEBoy. JMEBoy is a Java-based Gameboy and Gameboy Color emulator for mobile devices. If you want to play Gameboy games on your mobile phone you should try this emulator.

Plenty of free GBC homebrew ca be found here: http://www.pdroms.de/files/gameboy/

http://sourceforge.net/projects/javagb/