On the website of a friend and me we were setting up an atrium instance for our own, accumulated free software projects. You may take a look there to get a feel of what I mean:
http://community.moon-studios.com/
The reason this proposal did not get any grip was that the octave site is hosted on Savannah and they only allow static pages. Open Atrium requires php.
I think there are valid points in having a separation as well as having unity.