I just picked up the Panasonic QE-TM101 for mine. It's pretty cool, a space-age charger heh. It has sensors all over the pad, put the device on the pad and the sensors find where the induction receiver is, and automatically moves the transmitter over to it. So I never need to worry about lining it up.
Problem is that it doesn't have a trickle charge, but on the N7, I don't really care, because I don't need to leave it on all night like a phone.
It's on the slow boat from Japan right now, but I will report in on how it works when it gets here.
After watching a bunch of videos, I believe it's pronounced "Chee".
I read that any charger that works on the N4 will work on the N7.