The handsfree headset is wired - connects to the BB
Send an email to them and find out how long it'll take, I hear it's usually about a day -
The BB 8700 are very well made actually so only real obvious things like not turning on.
I think it's covered by Cingular, but sometimes you may have to interact directly with RIM.
You don't register the phone, you register your SIM. Natually you'll need some kind of BB data plan to get BB service, but you probably knew that already.