Mac Attack! I just bought a used powerbook and am looking for fun free/shareware

I’m a complete newb to the Apple world, but a co-worker was selling his G4 Powerbook that had iLife on it cheap and I couldn’t resist getting it to play with Garageband.

So, after some noodling, I found pearlyrics (sadly not available anymore) which brings up the lyrics of the song playing in iTunes. Awesome!Too bad it’s not out there anymore.

So Mac Users, what free/shareware are you using that you recommend? (Also I would be eternally grateful to find software that could take the vocals out of a song karaoke-style. My vocal teacher has a machine that can drop 'em and it’s fun especially on the obscure songs).