DNS Changer Malware

FBI Description

Nice Details from the FBI

Check Your Computer

FBI (this site has a list of checkers.  If you can read various foreign languages you should be in good shape)
(This one needs a valid DNS address.   It is not very user friendly but what do you expect from the feds.  I mean, how many real people know what their DNS IP address is??)

Other Checkers

Clarion Ledger Report