The DS still needs some work - you can't rotate the screens for vertically oriented games like Rhythm Heaven and Ninja Gaiden: Dragon Sword - but you can use your mouse or trackpad to emulate rudimentary stylus input. Portables are represented too: the Game Boy, Game Boy Advance, Nintendo DS, Game Gear, NeoGeo Pocket and even the Virtual Boy are playable. Presently, the attractive interface supports games for a healthy number of classic consoles, including the NES, SNES, Genesis, Sega 32X, Sega Master System, and TurboGrafx-16. Released this week only for Mac, the new emulator lets you drag and drop games from any of twelve different classic video game systems right into its interface, navigate using their cover art, and even hook up a wide variety of game controllers to play them with a minimum of fuss and bother. By contrast, OpenEmu is a breath of fresh air.
The world has no shortage of video game emulators, but many can be painful to use - many reflect their hacker origins with equally hacky interfaces, and you'd need a vast collection of different emulators to properly relive your childhood.