@Amigo1
IMHO, Feelin is very promising and offers new interesting features, the problem is that the API is still changing (faster than the builtin classes...) and the developer archive contains a significative amount of things "under construction".
It has several advantages over MUI/ReAction (no BOOPSI, XML stuff, ...) but ATM I'm not sure you have the minimum required for the typical GUI (e.g. : no menus).
Otherwise, it would be also a good candidate
