Flubba has released a new version of his Colecovision Emulator for the GBA Micro/Advance but it also works on the Nintendo DS and Gamecube Gameboy Player via a Flash Cart, heres whats new:

Some small fixes to Cologne, better sound (coming in SMSAdvance as well), fix a rare bug with Pogoshell and a real builder by Loopy.

Download from here --> http://gbaemu.dcemu.co.uk/Cologne.shtml