I've recently splashed out and purchased an Sony Action Cam and now I'm trying to work out some custom mounts for the camera. 

I'll be making something like this for trolling http://www.dredgecam.com/home 

Alex i used a wide angled webcam, housed in perspex just small enough to touch the sides of the cam on all sides.focusing can be done by the laptop or mini i think while i was at it i made it see infrared light by removing the filter..and i used an extension usb cable. i made it work but need something to stop water ingress as silicone did not cut the mustard or the heat made it condensate inside the housing...could always inject argon gas inside i guess..i then attached it to a rope or cord of sorts with sinker weight so it sinks below about 2ft more or less...so this is a work in progress ..i dismantled it, and will later rebuild it when i have the $$..