I set my eye-fi card up this evening on my home computer and the software quickly and effectively noted the presence of my home network.
What amazed and pleased me, though, was that my photos taken at home have been geotagged to an accuracy within one block! And I can't imagine that Skyhook decided to identify my personal wifi (and I can tell you that my roomie sure didn't submit the MAC address and such).
One thing I've thought of is that I'm in Mountain View, where we have wireless set up for the city by Google. But this Google wireless was not identified in the eye-fi manager, so I can't imagine it was being used for triangulation.
Any guesses how eye-fi magically geotagged my photos?