I have created a LeJOS extension for BlueJ which allows Java LeJOS apps to be compiled and run from inside BlueJ
ALSO
A NetBeans template module for LeJOS which uses an ANT script which integrates with the normal NetBeans menus and build buttons. Once you have created a new project from the template, you don't even have to worry that it is not a normal General java app.
The NetBeans module still has a bit of work to do
Downloads from http://homepages.feis.herts.ac.uk/~comqdhb/lego/

