Eye-Fi is a terrific idea.  Wireless capability from the camera to any one of 17 social networks or photo-sharing sites including Facebook, blogging sites like TypePad, photo-sharing sites like Flickr and Snapfish, or your PC or Mac. The price of $99.99 with 2GB of storage (about 1,000 photos) is not bad either.
The card has the software necessary to get you up and running. Just tell the card the service you want your photos sent to. It also archives the photos on your PC or Mac. However, you can send your photos to only one at a time. Currently the card supports JPEG files only, but transmits photos without any loss in resolution.