A brave MacBook Air owner (capitalizing on the Air's internal USB onnections we posted on previously) has embraced the wireless promise of Apple's ultra-thin notebook by installing a USB727 Verizon Aircard inside the Air. The hack involved disassembling both the Air and the USB EVDO modem and soldering it to one of the Air's internal USB connections.
Unfortunately, the hack also required removing the internal Airport and Bluetooth card (both to get the space and to use the Airport antennas), so I doubt most Air owners would be interested. Nonetheless, the end result is quite impressive and looks great. He has also started a forum thread to discuss the hack.
Update: The hacker who put the EVDO card into the Air is not the same as the one who previously discovered the USB connections.