You know what would make last.fm a really, really cool service? If their player would give you the lyrics to the song that you’re listening to in the player, under the artist info. That would be awesome.
On a related note, if iTunes can look up my album art, it should be able to look up the lyrics to my music too. Seriously guys, this needs to be in iTunes already. It’s crazy that I have to manually look up the lyrics to all of my music.