I've found that the list may cut down on calls but it doesn't eliminate them. The only thing I've found to work is to take the call and tell the caller that I'm on the list and please remove my number from their database.
There is an informative website at
http://killthecalls.com/ and they provide the attached "call sheet" for dealing quickly with telemarketers. I've found that it's the only thing that works 100%. Once you read the rules to them, you never hear from them again.
What I'd really love to see is a little PPC app that would allow me to take the call, then if it was a telemarketer, allow me to press a speed button to send to my pre-recorded PPC message that informs them that I'm on the do-not-call list and warns them not to call again. That would be sweet!