I was lucky enough to get an invite to the new Google Application service beta, and have been playing around with it.
I just put together a simple code formatting service application. This provides an html and web service for formatting / beautifying code.
You can find complete details on the about page for the service.
I will post the source in the next day or two.
Post any comments, questions, bugs or suggestions in the comments.
Update : I just uploaded the source to the app, which you can grab from the about page.