Start at the last page of the hacks forum and start working your way forward. Check out every thread that seems like it might be related to what you're interested in. By the time you've covered a couple pages of topics, you'll have a much better idea of what's technically possible and what's actually practical on a number of things including interfacing with the compacts' weird video.

Pay particular attention to posts by the green guys. Even if they won't tell you what to search for, they do know a bit about the topic.