My AVG picked up 1057 infections in a recent scan. I was freaked out, and immediately began researching. The infection is called trojan horse small.BOG. I found these links:
http://mashable.com/2009/07/24/itunes-trojan-small-bog/
http://news.puggal.com/itunes-trojan-horse-smallbog/
My only worry is that both these links say that it can return up to 181 infections, and my computer returned 1,057! What do you guys think? Am I good? Subsequent scans returned zero results.