Telezapper
Over on Evhead there was mention of the Telezapper. I've been seeing ads on TV about this for the last few weeks and I've been quite curious about it. The idea of it is that you have this box that lists to incoming calls and can tell which ones are from telemarketers. When it senses one from a telemarketer, it sends a signal back down the phone line telling their computer to delete your name so they will never call you again.

It's a neat idea, but I wonder how long before the telemarketers upgrade their software and make it obsolete.