Twenty minutes and $25 later, it is indeed plantar fasciitis.
Decided to treat with ibuprofen and ice rather than a cortisone shot for the meanwhile.
Also recommended -- don't run in Vibrams.
Too bad, Doc Rock. He knows I do, and he ain't happy about it. But as the choice is either run in Vibrams or don't run, I think I know which way I'm going. I just have to be extra careful about wearing my orthotics and stretching and all that good stuff during the times I'm not in the VFFs.
Aren't they supposed to STRENGTHEN your feet, not destroy them?