We are currently running a survey about the usage patterns of JDeveloper. You might have noticed a link to it in the follow up email you got after you downloaded JDeveloper 11 technology preview.
But just in case you missed it - we would love to get your input as well. This helps us understand how you are using JDeveloper (or why you are not using it) and hopefully will help us improve the product to better match your usage patterns in the future.
So check it out here.