Show HN: Who Will I Know There?
wwikt-peterldowns.dotcloud.com
wwikt-peterldowns.dotcloud.com
I don't travel enough for this to be interesting, but it could be for sales people who travel quite frequently for their jobs.
As a tangent, you could make a service called whom else should I sell to there... If I am going to make a sales call in san francisco, tell me what other companies with offices there I can call on as well.