You can download them on the project downloads page:
http://code.google.com/p/rainbow/downloads/list
Changes to beta 1:
Contributions by ghalib68:
Issue 79: Error when work with contents / add module to page ....
Issue 78: Error when working with user management after
installation
Issue 80: Error when working with user management after
installation - Part II
Known issue:
fix for Build error: the namespace 'Resources' already contains a
definintion for 'Rainbow'
see http://community.rainbowportal.net/forums/thread/14825.aspx
see http://community.rainbowportal.net/forums/thread/14694.aspx
Best Regargs,
RainbowPortal 2.0 Team