I've primed the pump with an initial release of a tool that generates Java stubs for Web applications described using WADL. Also included is a sample application that demonstrates use of the tool with the Yahoo News Search Service. The code implements the ideas I blogged here but is still beta quality. I'm hoping public availability will help flush out the bugs and highlight areas that need more work.
If you are interested in WADL and would like to help then please consider joining the project - there are many ways to contribute.