Just got an Eye-Fi SD card today with built in wi-fi. I have always wanted to try one out and sprung for the 4gb model. It comes with the Mac software right on the card and has a USB SD card reader in the package to allow easy install. It took about 10 minutes to load the software and get it all setup. With the MBA not having an SD card reader and limited USB, this is simply perfect for a digital camera. Pop the SD card into your camera, take a picture, and it appears magically within seconds on your screen and copies it to your pictures folder (or movies folder if you take a video)! No wires, card readers or anything.