The new Trojan/Erazor-A has an interesting twist. In addition to deleting or disabling various security products and competing malware, it deletes any porn, warez and music in your P2P directories. While some opine that this trojan might have good intentions, remarkably few things infect the text files this trojan also deletes. No one yet knows who wrote this or why.
This is quite a nutty program. Maybe the RIAA and MPAA are behind this? Check out the posting at Slashdot, and the virus information at Sophos.