Josh recently brought JXBusyLabel over with the rest of the painter_work branch. It wasn't really supposed to be brought over, but looked pretty useful (especially since it only contains 3 public methods: a constructor and an is/set property pair). I've cleaned it up, added comments, and committed it.
Of course, API shouldn't be coming over into SwingX unless it has been reviewed (or if it is being included as part of a fix, or preparation for review, for one of the existing components like JXTable). So I'm trying to get this one reviewed.
What do you guys thing? Worthy? There is more that could be done (such as providing a pluggable painter, pluggable timer) but doing more will involve more API review and such, which can always be done later. That is, this is a good basic API that we could grow over time.