One of the best tech things I saw at Zap Your PRAM was this TinEye Music app for the iPhone. You take a photo of album art with the iPhone and TinEye identifies the album and looks it up in iTunes. I was totally skeptical so we tried it out on my CD, taking this fairly crappy photo:
I was impressed. Image search/recognition tech usually works great inside a pre-defined catalog of images but tends to fail in the wild.
Later on I got a demo of the newest version of the iPhone app and it worked just as well but also had Allmusic, Youtube and Wikipedia links for me. Crazy neat. Thanks to Suzanne for showing it to me!