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I believe that the JGoodies looks and JGoodies forms should be incorporated into the NB3.6 IDE. Everything I have read, including user feedback by folks who have used it comes back with great praise. Please, please, please ADD it to the UI editor!
However this may change in the future, now we do not support other than standard JDK layout managers. Anyway, the value of the GUI tool should not be in that how many layout managers it supports, but rather how it supports the visual design - i.e. the quality of layout integration. We have things to improve, but I'm not sure if JGoodies forms is the way to go.