AFAIK the eye-fi firmware hasnt been hacked at all (yet), so it just uploads jpg files, doesn't work as a general wifi net connection
There is python code out there to receive them locally, and the card will actually send any data/text file if you rename it to .jpg
Look at this for a full function card realised now/soon:
http://www.trustedreviews.com/news/tosh ... fi-hotspot
Palm did release an SD wifi card for the tungsten/treo a looong time ago - remember them?
might be some mileage in finding one of those too (eBay?)