We've been waiting for an inexpensive wireless USB-to-HDMI solution for what seems like forever now, and it sounds like we'll finally have some options soon: Source R&D has just announced that it's going to be shipping the Warpia Wireless USB Adapter set at the end of May for an estimated $129-$149. Just like the Atlona AT-HDAiR, the Warpia kit is just a rebranded OEM unit from Wisair, so most of the same caveats apply: max resolution is 1400 x 1050, range is about 30 feet
