I'll be videotaping some hunts for the first time this year with a Canon GL2. We'll be using both the Pine Ridge arm as well as the Lone Wolf arm. I'll make sure we give some honest feedback for those of you who are interested.
Pine Ridge Arm -
http://www.shopatron.com/product/product_id=DUB2547/101.1.5331.0.0.0.0
Lone Wolf Arm -
http://www.lonewolfstands.com/camera_arm.asp
I've looked at the HunterCam Cradle arms and they look like a top notch product, and I have heard nothing but good things about them as well. If the above mentioned arms don't work out for us we're definitely going to pick one up.