I have one
So far, the Eye-Fi card performs probably about as well as you would expect it to perform. Connections between the card and my WPA Wi-Fi network are spotty. The setup program tests the connection between your card and the Wi-Fi network before it will let you finish. The first three tries from five feet away from the router were unsuccessful, but the fourth time was a charm. When the card is in my Canon Elph SD1000 camera, the connection is off-and-on (download a third of a meg, rest, download another third, rest, etc.).
The card pretty much requires you to turn off any auto-shutoff timers. The card can transmit pictures only as long as the camera is supplying power to the card, which means that the camera has to be on for as long as it takes to send the pictures. It doesn't hurt anything if you turn off the camera before it finishes sending pictures, though, so no worries there.
The card works only in infrastructure mode (no ad-hoc connections), and the card does not support wireless hotspots that require you to enter a password on a web page. So plan on using your own router (or on setting up the card to use a friend's router).
I have not yet been able to get any photos to dotphoto.com through the Eye-Fi service. I plan to try some other services later this week, but it seems like this feature is not quite ready for prime time.
A card like this would be overkill for most people. It sounds like a neat idea, but in most cases it would be faster and easier to use a card reader instead. One possible application would be if you wanted to take pictures at a party or gathering in a big room, and download them automatically to a printing station with a router, a computer, and a printer. You could take pictures at the gathering pretty much continuously, and return to the printing station every so often to queue another batch of photos without having to remove the card from your camera.
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