I'm constantly using Grooveshark. Since I have it connected with my last.fm, I can pretty much have everything I listen to showing on my last.fm, which is a big deal when I listen to music since i'm a dork who loves that stuff.

I love it too.

Unfortunately they recently started blocking it where I work (except during lunch). :( I've got several playlists I made just to listen to at work, now I can't use 'em anymore.

And what's really weird is, they haven't blocked Pandora. But I don't want to buy a subscription just to set up a playlist there.