Jonesy is right, this is a good thread. I struggled with several set ups and finally found something that works well for me. I use a Arkon clamp camera mount to hold my webcam. The camera is actually upside down (the blue tape helps keep it from vibrating as the camera has a bit of play in it) and I use x split to turn the image back upright. The mount itself is rock solid. My biggest issue was always vibrations and movement of the mount and camera. This one is relatively short, very stiff, almost too difficult to position but doesn't move at all, and it's a screw clamp on the cab rather than a weak spring clamp. So far zero issues with movement, vibration, it's not in the way or anything. Pretty sweet. Sorry, it's not on a DK cab, but should work with just about any game!
Tim