If you're interested, here are some pointers to relevant resources (snap4.tar.gz image works as advertised):
http://www.advogato.org/person/johnw/diary/12.html
http://www.cliki.net/VLM_on_Linux
http://libarynth.org/vlm_on_linux
The opengenera tar-ball can be found in the intertubes.
Tip: Use Ubuntu 7.04 x86-64 to save you some trouble. I don't know what is the most recent distro that works but 10.10 doesn't. You get a blank window because recent X servers are missing something. Before proceeding with the installation, complete the Ubuntu image with relevant archive server URLs to be able to apt-get with ease.