The good news is that this worm causes no damage yet, but it is extremely likely that a variant of it that does will be released very soon, so if you have not patched your systems be sure to [URL=http://windowsupdate.microsoft.com/]update now![/URL]
F-Secure has more [URL=http://www.f-secure.com/weblog/]info[/URL] on this worm.
UPDATE: [COLOR=#1951B9]Microsoft has posted an ActiveX [URL=http://www.microsoft.com/security/incident/sasser.asp]scanning tool[/URL] on their Sasser infopage, which you can use to easily check online if you're infected or not. Then again, if you are infected, you might not make it to that page before you're machine is rebooted again.[/COLOR] Source: [URL=http://www.f-secure.com/]F-Secure[/URL]