Just a quick copy and paste from my e-mail.

McAfee.com is issuing an update to the W32/Klez.h@MM virus alert. This is a HIGH RISK virus for HOME USERS, which is spread via email. McAfee.com has received reports that certain Klez variants have the ability to alter or destroy files if the virus is present on July 13th. As always, we recommend that you keep your anti-virus software up-to-date for the best protection.
Just so's ya know...