If you still haven't caught onto the iPad fever, maybe the new USing Kareoke app will change your mind. Yes, that's correct -- there's an app for your horrible singing voice.
The USing app gives you 30 thousand songs to choose from, which means you can sing anything from Tina Turner to Earth, Wind and Fire (maybe some Elton John too). I'm actually considering buying the iPad solely for the USing Kareoke app. Seriously, it would be hilarious to be able to belt out tunes with lyrics in cabs on the way home from a night out.