FluBBa has released a new version of Murdoc the MR Do Arcade Emulator for the GBA MIcro/GBASP, (also works on Nintendo DS and the Gamecube Gameboy Player via a Flash Cart)

Heres whats new:

V0.02 - 2005-09-17 (FluBBa)
Optimised sound mixer.
Fixed a CPU bug (RETI/RETN).

Download Here --> http://gbaemu.dcemu.co.uk/murdoc.shtml