There is no magic fairy dust protecting Macs - Dai Zovi, security researcher and co-author of The Mac Hacker's Handbook.
Details here:http://msmvps.com/blogs/bradley/archive/2008/06/16/houston-we-have-a-problem.aspx
Update: We'll be offline until as late as Friday:http://msmvps.com/blogs/bradley/archive/2008/06/16/offline-for-a-couple-of-days.aspx