<a href="http://hem.passagen.se/flubba/gba.html" target="_blank" >FluBBa</a> has updated hisSega Master System emulator for the GBA (works on Nintendo DS and Gamecube Gameboy Player too), heres whats new
V0.5 - 2005-08-13 (FluBBa)
Added Codemaster & Korean mappers.
Added a 32k SRAM support for Shining Force 2 & 3 (not saved yet).
Fixed a memory management bug again (Shinobi in some cases).
Fixed a rendering bug in 224 mode (Codemaster games).