I'm not a huge user of Stack Overflow, but that's mostly a byproduct of having very little free time at the moment; I think it's a great resource and am surprised by just how often the exact question I have is answered there, saving me the time of figuring it out or researching the Apple's documentation (don't disregard the documentation just because you find an answer there, though!). When my life settles down a bit, I hope to contribute some responses to unanswered questions.
Recently, somebody referred me to a question on Stack Overflow that's actually a mini-treatise on the use of UIImagePickerController. I'm not sure why the author, Peter Hosey, chose to post this information as a question, but there's a lot of great information there, and it's well worth a read if you use UIImagePickerController in your applications.
Whoops!: I screwed up. As was pointed out in the comments, the original author was Itay Neeman. Itay turned the question into a community Wiki, and Peter Hosey was one of a handful of people who made contributions. My apologies for the screwup.