Nikon puts new Coolpix S51c on T-Mobile HotSpot network: The $330 Wi-Fi-enabled camera, shipping later this month, comes with six months of free use on T-Mobile HotSpot's U.S. network. The camera has an 8.1-megapixel sensor and 3x optical zoom. The six months begin from the first connect, which has to start before Aug. 31, 2008. These deals simply further emphasize how difficult it is to connect cameras to hotspots, as the cameras lack browsers.
None of Nikon's information explains the down-sampling that will be involved with emailing photos from the camera; it's unlikely that full-resolution images would be transmitted. Further, Nikon's previous software releases required software to be installed to transfer images at full resolution over a local network. The S51c comes with Mac and Windows software, so that's likely still the case.
No Wi-Fi camera has yet been released for the consumer market that simply allows file transfers at full resolution over any network reachable when connected via Wi-Fi, nor full-resolution image transmission. None that I'm aware of include secure file transfer, either, although Nikon says its associated picture service for this and other cameras uses some secure method, not defined.
Even the iPhone, with access to Wi-Fi, and with low-resolution photos, only emails or posts to Web galleries downsampled versions. You have to sync over USB to transfer the full resolution.