Hey, has anyone checked out the Musician's Companion from Yamaha? It's a chord reference/metronome/pitch pipe that you can download to your cell phone. I think you can get it on a few handsets from Cingular right now - www.yamaha-wireless.com.
There is a program at <a href="http://www.chordmaestro.com" target="_blank">http://www.chordmaestro.com</a> that you can use to look up chords on your mobile phone. It also includes a pitch pipe and a metronome.