for those of us who are stuck at computers all day - whether it be for work, for school, or just because you're addicted to the internet - there's a great website that i've been using for about a year or so for my music needs.
http://www.pandora.com
basicly, it's a standalone music player that's completely free, commercial free, and only plays music you like. here's the link for The Music Genome Project© that started the whole thing:
http://www.pandora.com/mgp.shtml
i listen to it all the time. i hope you enjoy it too.