If anyone's interested, attached is the gov't "do not call list". I signed up for this about this time last year, I get maybe 1-2 calls PER MONTH!!!!
It's easy to sign up, and it's good for 5 years. If you do get a call, you can simply say "I'm on the national no call list". If you want, you can even register a complaint on this same web site. It works great.