Oracle JDeveloper 10G production version has been released. You can download it here. All tutorials and howto's have also been updated.
One thing i'm interested in is if the binding language for data actions has been documentened and extended. Recently i tried to bind some input fields in a html form to a web service call (through adf data actions), but all input fields had to be mapped to attributes of one parameter object. I have no idea how to do this, only work around i can think of is to create a stub procedure which takes one parameter per attribute.