From their press-release:

The FBI is seeking information from individuals, corporate entities and Internet Services Providers who believe that they have been victimized by malicious software (“malware”) related to the defendants. This malware modifies a computer’s Domain Name Service (DNS) settings, and thereby directs the computers to receive potentially improper results from rogue DNS servers hosted by the defendants.

If you believe that you are a victim in this case, the FBI wishes to hear from you.  Submit your report here: https://forms.fbi.gov/dnsmalware

For more information about Operation Ghost Click:

• http://isc.sans.org/diary/Operation+Ghost+Click+FBI+bags+crime+ring+responsible+for+14+million+in+losses/11986
• http://www.fbi.gov/news/stories/2011/november/malware_110911