This seems to be a good week for Caelum. It's development is much better by using some tools like task management and the patch tracker. The "stabilisation" task has gone into beta phase, and I've got it to finally run under my Ubuntu distro.
I've had a lot of issues with the nVidia drivers and the kernel headers, but it's finally working. Here is a screenshot I took some minutes ago of the Caelum demo under Linux :) Next: Getting Java and JavaCC to run :/