It would be interesting if you have a clean upgrade solution: that is, I 
would like to be able to upgrade the appliance to a completely fresh VM 
image without losing my local changes. (Perhaps using an overlay 
filesystem, e.g. unionfs)

If the image has to be maintained using the normal OS mechanisms - 
apt-get update or whatever - then I don't think I'd be interested. There 
are plenty of existing mechanisms for bootstrapping a VM image.

Also, it would need to be ruby 1.8 for me.
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