Just though its useful info in this part of the forums, with all the people looking to get a new BB8700, or catch a deal on the 72xx series.
RIM is giving free bluetooth headsets to anyone that buys a new BB (7100i, 7105t, 7100t, 7100g, 7290, 7250, 7520, or 8700c) a free Motorola Bluetooth headset! It looks like they are going to give out the HS820, but its better than nothing!
It looks like you just fill out the form, send it in, and they send you a BT headset within 10-12 weeks... ouch. oh, and this is valid for United States ONLY
Boo hiss :(
Info can be found on RIM's website here: http://www.blackberryfreeheadset.com/
The form to fill out is here: Download Form