Windows Mobile Standard
Look for Pocket Nester in the Apps for Dash category. It should work considering it's WM6. It's a .cab file and shouldn't cause any problems. Hope this helps.
It is an all-in-one emulator. I don't remember where I found it, but it does NES, SNES, TurboGFX16, NeoGeo, SegaMasterSystem, Gameboy, and Gamebody Advance.
Haven't tried it on a Windows Mobile Smartphone edition, but it works pretty good on my PPC6800--although it's running WM 6 Pro.
"It ain't broke, it just needs duct tape!"