The new Nikon-compatible PocketWizard wireless transmitters and transceivers are now shipping to dealers in some areas. They're expected to be available to users in the US sometime by the middle of December. The MiniTT1 sits in the camera hot shoe and the FlexTT5s are used at each remote flash, and enable i-TTL via wireless radio connections. The radio communication tends to be more flexible and reliable than the IR-based wireless built into the Nikon Speedlights. There's much more to the new system than at first meets the eye, as it supports some other new flash capabilities, including HyperSync, or faster-than-sync-speed syncing. Serious multiple flash users really need to take a close look at this new product.