a prank caller's best friend.
Google Voice User (Andrew): Is your refrigerator running?
Friend: Who is this? It can't be Andrew, because that's an Alaskan area code.....
a service that allows its users to manage their incoming and outgoing calls and to setup custom voicemail messages for groups or individuals.
see also: GVoice
Google Voice User: Hey, my new number is 504-555-1234.
Friend: What happened to your old number?
Google Voice User: I still have it, but now all my calls are forwarded from my new number to my cell phone.