Here's a tool to detect and remove the Sony Rootkit, as well as the first of the hacker viruses designed to ride on it.
http://www.sophos.com/support/disinfection/rkprf.html
I can't vouch for it since I'm not infected, but it is recommended by several trustworthy sources.
Thanks, I am clean
Tested clean... thanks for the tip. No Sony CDs for me! And to think we have been loyal Sony buyers since 1983... darn!