<a href="http://hem.passagen.se/flubba/gba.html" target="_blank" >FluBBa</a> has updated his Sega Master System emulator for the GBA (works on Nintendo DS and Gamecube Gameboy Player too), heres whats new

V0.6 - 2005-08-15 (FluBBa)
Fixed Gunstar Heroes (bug in V0.5).

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