GrandCentral is looking to change the way you use the phone. They offer a service the claims to give you a free phone number for life. Using this phone number and their service, you can have calls to that number forward to any number of phones (including forwarding to multuiple phones at once); a single voice mailbox (with email and SMS capability); call screening, blocking, forwarding, and recording; ring tones that are caller dependent; and more.

Normally I'd be pretty suspect about such wild claims from a small company. But Google just bought them, so there might actually be something there. They are currently in Beta, but they are accepting applications for their service. I'm not sure if there is an advantage to getting this service early, but I'm signing up... after all, it is free.