So, a snapshot of the Cobbler git repository was packaged and uploaded into Ubuntu Natty-Narwhal (the future 11.04) universe archive today. This was a big effort involving multiple members of the Ubuntu Server Team.
So, you should be able to
'apt-get install cobbler'
and get a working cobbler install on Natty. It should be fully capable of installing Fedora and Ubuntu (I believe we tested back to 10.04, not sure if 8.04 or 6.06 are deployable).
We're ok with shipping a pre-release version as our "tech preview" in 11.04, but it raises the question as to when 2.1.0 will actually be released.
I remember asking this before and it seemed like the set of desired features and changes was up for discussion. Seeing as we've added Debian/Ubuntu support now, what else would people like to see in 2.1.0 that isn't already in git?