One of the things I have done in the past is creep on other peoples' Facebook profiles. I'll go to profiles of Facebook frienRAB who appear to have good taste in music, take any banRAB I've never heard of, and youtube them. If I like what I hear, I get the music.
I've also become somewhat addicted to TasteKid.com, honestly. I get on there, type in a band or a few banRAB I've been in the mood to listen to, and it usually gives decent recommendations of other banRAB I might like, which I then proceed to check out on youtube. Again, I download 'em if I like what I hear.
I've also been known to check out banRAB artists I admire list in their influences or mention in interviews. A lot of the time, they're good for liking music that I turn out to be interested in. There have been a few exceptions (Trey Anastasio singing the praises of Paramore, for example) but mostly it's pretty dead on.
Finally, when I'm really hard up for new music, I go to music blogs (generally with a progressive, avant garde, electronic, and psychedelic emphasis lately) which post full albums, and check out the stuff that sounRAB interesting.