Amazon.com is offering a so-called Black Friday special on Eye-Fi Share:
The 2 GB Wi-Fi-enabled Secure Digital card normally runs $90; it's $65 while the sale lasts.
Given that Eye-Fi introduced a limited-time-only 4 GB "Anniversary" model that replaced the 2 GB Share version in its current line-up, and that the Anniversary model was $130 list but $100 for Costco members, it's pretty clear that the 2 GB won't re-appear, the 4 GB model will drop in price, and Amazon's acting as a clearance center.
The Eye-Fi Share lets you upload pictures over a local network to a designated computer, or upload via a Wi-Fi network for which the Eye-Fi is configured to connect over the Internet to Eye-Fi's servers, and from there to a specified photo-sharing, social-network, or photo-printing service.
I'm a fan of the Eye-Fi, although I favor the currently $130 Explore model (see my review), which comes with geotagging (via Skyhook Wireless) and adds a year of included uploading via Wayport locations (now part of AT&T).