<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 - with a GBA Flash Cart - and Gamecube Gameboy Player too ), heres whats new
V1.0 - 2005-10-14 (FluBBa)
Fixed Codemasters mapper (broken in V0.9).
Cleaned up the mapper code a bit.