The iPad is a great gaming system by most accounts with tons of apps already available to let the owner play all the games they want. There are also a lot of options for hacking the iPad to play emulators for old school games as well.
A four-step process will turn your iPad into a SNES emulator complete with support for control via the iPhone or iPod touch or a Wii Remote. The process first requires the iPad to be jailbroken. The emulator used is called snes4iphone, though others are available.