Just about my only disappointment with Nikon's recent announcements of the D3 and D300 is that they clearly didn't feel the need (or, possibly, didn't have the time or the resources) to update the otherwise excellent iTTL flash system from clunky line-of-sight infrared to useable radio.
Clearly I'm not the only one who'd like to be able to control remote flashes from the on-camera master unit. This new product, currently in development, sounds as though it should solve the problem. I'm intrigued to find out exactly how it attaches to the flash ('lick 'n stick' doesn't sound terribly appealing, to be honest), and of course it won't solve the problem of the built-in extra shutter lag that iTTL introduces. But it's an interesting idea, and I really hope it works.
Oh, and apparently it works with Canon's flash system too.
Thanks to Gerhard Engelbrecht for bringing it to my attention.