A few month ago, I decided to publish to the community a Java ME UI Framework as an Open Source (GPL) project. At this time I didn't find over the web any toolkit the correspond to my needs. This library is Kuix, more informations could be found there : http://www.kalmeo.org/projects/kuix .
To be able to make Kuix someting that could be interesting for you, I would like to know what are your need in terms of UI Library ?
Performance ? Cool animations ? Easy to develop with ... ?