I received a nasty virus today called W32/ProLin@MM. It comes from someone you know and trust as:

Subject = A great Shockwave flash movie Body = Check out this new flash movie that I downloaded just now ... It's Great Bye Attachment = creative.exe

This bugger replicates onto your c drive and reaaranges your jpeg and mp3 files. It then takes your address book and sends itself to all as if it were you!

I found this particularly disturbing...