The SoundTech Ediface is an interesting device. It’s basically a pickup that attaches to any guitar and then converts what you play to digital format. It comes with a game called Guitar Wizard that “allows users to jam along to popular songs while learning to play a real guitar.”
The Ediface is compatible with popular audio recording programs like GarageBand and Sony’s Acid Music Studio so you can play your guitar and have it output sounds like woodblocks, piano keys, and screaming cats or whatever other samples you’d like to use.
It’ll be available in the next few months for under $300.