Jon:
The New York Times Magazine features a comprehensive look at the ZipCar phenomenon in today’s issue.  I was struck by the way in which its target audience perfectly aligns with ours:
Zipcar, which has been doubling its ranks annually for much of its existence, sees many more prospective converts, an environmentally aware, cost-conscious, Internet-bred generation of [...]

The biggest challenge CabCorner faces, like any startup Dot Com, is reaching the critical user mass.
In order to attract users looking to share a cab ride so as to reduce travel costs, CabCorner requires multiple users creating or joining taxi trips through the website.  But if there are no fellow travelers to be found, there [...]