For the tweakers, here's my current gopro line mount which only costs about $5-$10 and 10 minutes max to make.

It is stable enough for video use in everything apart from nasty chop (read Dolls Point) and you can keep the camera level by twisting your bar slightly (which I forgot to do in my sample shot).

Hopefully the build is self explanatory but if not the body is 25mm high pressure pvc pipe, 2 t joiners, 2 plastic rings, some tubing and some shock cord. To setup the rear lines go through the rings and the front lines cable tie to the tubing under the rig.

For the gopro hd wide in 720p mode you want the camera to be between 1.2m and 1.8m from your harness hook when riding, and for 1080p you want the camera to be between 1.8m and 2.5m from your harness hook when riding.

Standard disclaimer: User beware! Don't forget to use the camera leash. This works for my kite, but may not work on yours and/or may damage your gear and/or may result in a nasty tangle if you crash your kite and/or may make the safety tangle and/or may stop the safety from working all together. Most importantly, be prepared for people to ask you what science experiment you have in your kite lines.

Enjoy!

PS patent pending (no really)
PPS thanks to rob for the inspiration at http://picasaweb.google.com/primalmystery/GoPro_FrontLines


Sample view - who needs surf!





Top view





Bottom view