One of the presentation I did at Oracle Develop this year was titled JDeveloper Treasure Hunt. I had about 70 people in the room and we went through a set of tips and tricks and some hidden gems/features in JDeveloper.
I got several requests to post the slides, and since I think these can be helpful for anyone using JDeveloper on a daily base - here you go.
I hope you can understand the points from the slides even if you don't get to hear me talk to them or see the demos.
One more thing you might have missed if you didn't made it to the session is the little magic trick that I got JDeveloper to do.
Lucky you, Eddie Awad did manage to capture most of it on his video camera and posted the video here.
And since you don't see the screen shot at the end that well at the end, here is what the people actually got to see when JDeveloper started: