FaceTime on Multiple Devices

Since FT on the new iPods is linked to an email address rather than a phone number, just like the new FT for Mac released today, it seems that making a FT to an email address will simultaneously ring both an iPod and Mac which are linked to the same address.

I think this is great behavior, and would ideally like my iPhone to linked in the same way (via an email address), so that someone trying to find me on FT could make ONE call, to my FT email address and ring my Mac and iPhone simultaneously, just like an iPod.

Has anyone found a way to link an email address to FT on the iPhone, just like on the iPod and the Mac?