Getting a free U.S number?

I have known this for a while now, but I realize many people do not know about this cool service from IPKall: You can get a free number in 4-5 washington state area codes for the U.S from IPKall. So what do you do with that? Ok, here is what we do - we take that number and tell IPKall to pass it as a SIP call to our system which then distributed it to a bunch of people like agents in a call center. Cool. Isn't it?