in flight video
Check out the GoPro video camera. It does HD, records to an SD card and can capture cockpit sound. To tap the camera directly into the audio/radio/intercom would take a little more work but shouldnt be too hard. You can also "double record", meaning you can capture the audio with a separate and very cheap mp3 recorder. Before engine start, clap your hands together with the intercom microphone open so that the camera and the digital recorder capture the sound at the same time. Also, try to clap where the camera can see your hands come together. Then sync up the audio and video tracks in an NLE video program. Camera is about $300US, a digital recorder about $50-70US. Piece of cake.
The beauty of the GoPro is the quality of its video for its size. Its actually smaller than a pack of cigarettes and its extremely light. Consequently, it can be mounted almost anywhere. A lot of reality shows on TV these days use them. I've mounted them in aircraft, cars, etc. This is a technology that didnt exist until very recently.