By now, you must already be familiar with this product. I had also posted about it on its launch, Upload Photos from Your Camera to the Web
and also when it provided support to Windows Live Spaces which enable user's photos to be seamlessly transferred from their camera into their Windows Live Space.
Upload your Photos wirelessly from your camera to Windows Live Spaces
For those who are new to Eye-Fi, "The Eye-Fi Card is a wireless memory card. It automatically uploads pictures from your digital camera to your PC or Mac and to your favorite photo sharing, printing, blogging or social networking site. No cables, no waiting, no hassles."
Video link : Eye-Fi Wireless Memory Card