Small Digital Osciloscope

Oscilloscopes are awesome. I just haven't seen one since my dad brought one home in the 70's. I want a handheld one, or a plug-in to a Palm Pilot or other PDA-sized thingy. Perhaps Fluke already has this. I want to plug my guitar into the thing and see the waveform, and tweak it if necessary. Is this already part of high-end guitar tuners? Is it an esoteric part of Garage Band? Crap. I want one anyway, and it can double as a cool blue nightlight, yo.