For the last couple of weeks, I've been working with two very capable wireless HD systems: the HDMI-based Paralinx Arrow and the HD-SDI-based Teradek Bolt Pro.
I should have a review posted within two weeks, but I can say that both systems are remarkably good at deliverying a high-quality HD signal from your camera to a monitor, without a damn cable. The Paralinx is smaller and more affordable at $1199, but the lack of HD-SDI connections is obviously a deal-breaker for some. The transmitter also broadcasts to just one receiver.
The Teradek Bolt Pro works with HD-SDI, can broadcast to multiple receivers, and also features a built-in battery for its camera transmitter, so you don't have to worry about plugging in a USB external battery or plugging into a bigger battery's power tap. But the Bolt costs pretty much double what the Arrow costs at $2490.
More in a couple of weeks!