Im not a lawyer, but I have one...
Just my two cents...
But unless you took the time to register your title with the Federal Copyright Office (http://www.copyright.gov/circs/circ1.html#cr) remember that all you can do when someone infringes on your copyright is ask for a cease and dessist. You can not seek any other damages. (See the second bullet point on the government website regarding this fact.)
Only movies that are REGISTERED with the copyright office enjoy that protection. I wonder how many studios actually take the time to do that...
If your product is registered, you do not need to contact the websites at all. Simply contact the FBI (http://www.fbi.gov/cyberinvest/cyberedletter.htm)
and an agent will be in touch with you.
The FBI is very FAST and and FREE to use if you feel someone is violating your REGISTERED Copyright. Of course, while they are taking your complaint, they might want to peek at your 2257 docs, so make sure your shit is inline first.