Another power solution is to use USB port on the HDTV to power the device. As most newer HDTV's have both HDMI and USB connections.
Wrong end. The Hammerhead sits at the VGA device, so unless you are close... however, HDMI carries power. Some HDMI devices are line-powered, and a lot are not. Boggles my mind sometimes.
However, I have a wireless HDMI setup at my office. The receiver is USB-powered and I use the USB port on the TV to power the receiver, which works very well.
To that end, these are AWESOME:
Wireless HDMI Transmitter and Receiver Kit
And you can get them here (another highly recommended vendor):
IOGEAR Wireless HDMI Transmitter and Receiver Kit
5GHz wireless HDMI. The receiver supports up to four transmitters plus one local input. I have not yet tested for range, but in my office they work amazingly well without any perceptible delays between the audio from the computers and the video on the TV. At 5GHz, you are above the congestion of the over-used 2.4GHz wireless spectrum. The only complaint I have, and it may actually be the TV, is how long it takes to switch inputs (15~30 seconds,) but I see that as an acceptable annoyance given the functionality gained.
I still have a 32" CRT TV, and when the time comes to replace it I will be getting a projector and will use this kit to maintain my cluster of entertainment equipment on one side of the room and the projector on the wall opposite (or wherever.)
The biggest plus about this kit versus other wireless HDMI is that it uses a real HDMI input, not a USB transmitter which requires drivers paired with an HDMI receiver. I actually tried one of the IOgear wireless USB/HDMI video kits and performance was horrible. Like almost every USB video device it uses the DisplayLink driver set.
Another kit I recommend is the Gefen wirelesss HDMI. It is pricey, but works damn well. I deployed one of these at a church and it works fantastic. I am pretty certain the kit I deployed is a discontinued 2.4GHz set while this is 5Ghz, so I may have to give a YMMV warning.
Gefen Short-Range 5GHz Wireless Extender System for HDMI (33', US)
Available with a long-range transmitter:
Gefen Long-Range 5GHz Wireless Transmitter for HDMI (100', EU)
And, holy crap, looks like IOgear is coming out with a ridiculous long-range kit
IOGEAR Ultra Long Range Wireless HDMI Transmitter and Receiver Kit