I use pSX for Playstation emulation. I have both ZSNES and SNES9x, I generally prefer the later. For my Nintendo I have VirtualNES, which is pretty reliable. In the handhelds I just have VisualBoy Advanced. For my N64 games I use Project64, which I don't use to much save LOZ:OOT/MM. Last but not least at all I have Fusion which is an emulator for Sega SG-1000, SC-3000, Master System, GameGear, Sega MegaDrive/Genesis, Sega MegaCD/SegaCD, Sega 32X, Sega CD+32X, Sega Pico and Sega Virtua Processor.