Its been a while since we last discussed GUI builders and LWUIT, we spent some time thinking of the whole "gui builder issue". The biggest issue with GUI builders IMO is the code generation aspect, so when creating the new LWUIT GUI builder we just removed that aspect completely opting to make use of our existing resource file and resource editor architecture to allow a GUI builder that doesn't need to generate any code.
You can see a quick demo video on the right and you can try the webstart version right now to see how this works for you.
There are allot of things in the new GUI builder and I will try to keep you posted on how to use them in the best ways possible. The demo I'm showing off is a clone of Ruhlman's Ratio application which is based on his great cook book.