[Linux-cluster] Open Source VM Solutions?

[isplist at logicore.net]

Bit of topic but it's a good place to ask.

I've just recently started thinking that I might want to check out virtual 
machines using GFS and fibre channel. I just found that Zen seems to have been 
bought out and I'm not coming across much else for well developed open source.

Is there anything else that others on this list are using which might be 
interesting?

Mike