One of the nice things about SourceForge are the hosted applications it provides to enable:-
to be made in a systematic and traceable way using a tracker tool.
There is a wiki for the trak project on Sourceforge which covers the trak, trakmetamodel and trakviewpoints projects.
In addition there are discussion forums for posting and responding to topics raised
There is a more general wiki for the TRAK community that covers TRAK-related topics and more general modelling including the application of views, organisation of models etc.
The ways in which you could help - if you've the inclination to are covered on the Open Source page. You don't need to be a brainiac or a large organisation to help make a difference!