Module development for NetBeans is something I've always been interested in, but never had the time to do. This time, however, I was able to; the ThinNB project at java.net adds Thinlet support for the NetBeans IDE.

From the ThinNB project home page, "ThinNB is actually two things: an umbrella project for the ThinNB family of NetBeans modules and also the module responsible for installing the ThinNB Update Center in the IDE." It recognizes Thinlet xml files, adds a new template for a xml file with a panel as it root node, allow files to be previewed inside the IDE, adds support to an embedded visual editor - a modified version of ThinG - and also installs an Update Center in the IDE so it is possible to obtain new releases of the modules in a more natural way.

You can go to the home page to see some screenshots, get information about its features and also read the download and installation instructions. Enjoy it!