Kind of a neat little website that has an updating list of metal artists and their ten best songs. Now I don't know who is ranking these, but from what I checked they seem to do fairly well. I don't listen to alot of these artists enough to tell if the lists are accurate, but I like the ones I do know.
Top 10 Songs By The Greatest Metal Artists
I seems to be powered by Nutsie, which is a semi-interesting site for lists and hearing new music.