The scum that NOD32 ate this morning was listed as containing the Mytob.CD worm [and there's two more being eaten as I type].
I've had a few days of this virus hitting the inbox. The social engineering aspect of the messages (your e-mail account is suspended, open this to fix it) will easily convince the less web-savvy recipient to open the message. It won't work if you get a large amount of e-mail, but will for those who only get a few.
Secunia Virus Information: MYTOB.CD
Net-Worm.Win32.Mytob.gen, W32.Mytob.BD@mm, W32/Mytob, W32/Mytob.CL@mm, W32/Mytob.gen@MM, Win32.Mytob.BO, Win32/Mytob.BO!Worm, WORM_MYTOB.CD