Whiteoak 2.1 is out and can be downloaded from the nearest
sourceforge.net. In a nutshell, Whiteoak augments Java with stuctural
types ("structs") that provide much more flexibility than interfaces.
Structural types allow the introduction of new, override-able, methods
into existing object and the composition of new objects from existing
ones using mixin-like or traits-like semantics, and much more.
This is the first time that Whiteoak is fully open source, can be used
from an IDE, and even more importantly: has a decent web-site:
http://whiteoak.sourceforge.net
This list will be used for making suggestions, raising questions,
reporting issues, announcing and in general: contacting the Whiteoak
team.
Enjoy.