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

Heres whats new:

V2.3 - 2005-09-17 (FluBBa)
Fixed MultiBoot transfer.
Fixed a bug in the sound init.
Fixed the RTC a bit.
Changed some small things in the cpu core (DK and Kirby faster).

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