http://www.sdsc.edu/~jeff/spam/cbc.html
It appears from Jeff's Blacklists Compared list the Barracuda has overtaken spamhaus for the #1 position. Not sure about the accuracy of the list as compared to spamhaus but seams reasonably good to me. I don't really count apews myself since they are extremely bad, but my hostkarma list is next beating out abuseat, sorbs, and uceprotect.
Thanks to everyone who is helping me with my tarbaby project to catch virus bots.
http://wiki.junkemailfilter.com/index.php/Project_tarbaby Congrats to Barracuda!