There is also
Finetune - even with your everyday artist you can hear on the radio etc.
SeeqPod - just searches the web and gathers it, so you can play it.
StumbleAudio -StumbleUpon for music or so
And a online radio, with popular artists, too. I always forget how it's called, but it's well-known compared to the rest.

I quite enjoyed Pandora before they tightened up on their IP allowances and cut off Canadian users. It was a nice, simple system.

www.thesixtyone.com - is actually free to listen to (and, if the artists allows it to download from), without needing extra players. The "social game" aspects of it are a bit silly but I did find a good number of interesting music already.
Nothing so far could replace vitaminic.com though :(.