Mic updated his recently fresh released GBA emulator Gebea. It’s now on release three and has these features:

2004-09-12CPU: Fixed HI/LS flag for some instructionsCPU: Fixed flags affected by Thumb MULCPU: Fixed flags affected by Thumb NEGCPU: Fixed flags affected by Thumb hi register instructionsCPU: Fixed Thumb LDSH Rd,[Rb,Ro]CPU: Fixed offset calculation for Thumb load/store with immediate offsetGUI: Added a ROM info dialog

http://www.cyd.liu.se/~micol972/site/gebea/