I know this might not be news to some, but it was new to me and I though it was pretty sweet:
Lectrosonics Super-Miniature Transmitters (SMV/SMQV) are typical awesome products - 50mW, 100mW, and 250mW selectable power output, digital hybrid wireless, and are completely waterproof when you put the silicon boot over the mic jack input.
The rep explained to me that when these are in sleep mode, all the wireless is off, but the preamp is still on, so you can turn them on by playing a series of tones in to the mic on your talent. That way you can hand over a mic in sleep mode to wardrobe, it can be hidden away where you can't reach it, and you activate it right before you start shooting without having to grope anybody. You can buy a little remote control that fires a tone for on/off, lock/unlock, and volume setting. But you don't need to buy it, you can just grab the wave files from the website and play them from an mp3 player. Or, there is an iPhone app coming soon.
Price is going down...I'm going to start saving up for a set.
Other cool product they were showing was the Quadra Wireless Monitor. It lets you transmit up to 4 discrete channels at 48k/24bit that can be mixed by the end user, so you could drop the boom and a lav or two, and a talkback mic and everybody with a receiver can listen to what they'd like. Also great for mixing monitors for musicians - just get an even mix of vocals, guitars, drums, and keyboards and each musician can dial in what they'd like.