Lists some van services that go to Berkley. I haven't been able to find anything about a bus to the Clark Kerr campus.
The vans are cheaper with more than one. I will be arriving 11:09 am (if all goes well) and would be happy to share a van with someone if there is not a cheaper bus. E-mail me, and we can arrange a meeting place.
In general, perhaps people interested in sharing ground transportation could congregate on the center island outside the airline ticket counters, where the vans pickup, and hold up a sign saying "Extro4" or wave your Alcor tag or something.
Steve Van Sickle