Flubba has posted some more news and screens of his work to bring a MSX emu to the GBA, heres the info:

I just have to tease you some more before I release the MSX emulator :P.
I've fixed up most of the sound, I think all functionality should be emulated correctly, some games still sound bad though.
I added a new scaling mode which looks quite nice if I may say so =).

screens here --> http://hem.passagen.se/flubba/gba.html