Unlike the Eye-Fi wireless SD cards which lock you into a set amount of storage, PQI's Air Card uses a microSD slot so that as the tiny cards get bigger and bigger, you can easily upgrade the adapter's capacity.
And like the latest generation of the Eye-Fi cards, the $50 PQI Air works with mobile devices thanks to an accompanying iOS and Android app. So you can share photos and get your snaps online without the need for a card reader or a USB connection to a PC. It works with three devices at once too, so you can send shots to your phone and tablet at the same time, and according to the PQI site it supports pretty much every popular camera on the market today. [PQI via DPReview]