Normmatt has released a new version of DSemu the GBA and Nintendo DS emulator for windows, heres whats in this release:

"Here is a release of DSemu with X/Y keys emulated and working you can check with Tetris 2P by DesktopMan also this version included the bios functions Arctan pn both ARM7 and ARM9 and Arctan2 on ARM7 though not much having the X/Y keys emulated means DSemu is the first emulator to emulate the X and Y keys YAY! "

Download <a href="http://nintendo-ds.dcemu.co.uk/dsemu.shtml" target="_blank" >Here</a>