A NeoGeo Emu which I haven't tried yet

Catching up quickly and increasingly popular in NeoGeo emulation, this is version 0.22

The Bloodlust Team does NeoGeo. We're all waiting for the sound support

The brandnew and absolutely awesome NeoGeo emulator from the Rage team. It's the Windoze version, requires DirectX and now features full sound! This is version 0.6

And this is the small update to 0.6 with the overclocking possibility included.