I bought the Eye-Fi SD Card from Photojojo (my first purchase from them, actually — a good experience) and it’s spectacular. What a great product! I have some more testing to do, but from what I’ve seen so far, this thing is really cool. Apart from uploading photographs to lots of online services, it’ll also make a copy of your photographs on your computer, basically eliminating the need to sync photos to your hard drive. And the setup was blissfully simple and quick.
(taken and uploaded to Picasa Web with my new Eye-Fi)