Oh man, I love Hallowe'en music. I collect any of it that I can find. I have gigs upon gigs of the stuff. I make a mix every year to give out. I especially love the rock 'n roll novelty songs.
Definitely check out Neverending's online radio station:
http://www.neverendingwonder.com/
During October, he has a secondary station that plays all Hallowe'en and horror related stuff. It's great.