Two promising alternatives exist:
- Cosmos - there is a chunk of work yet to be completed – however I like the lego metaphor! See the Virtual PC example (for an earlier Cosmos build) here.
- SharpOS – I’ve been unable to access their website http://www.sharpos.org/ recently (I’ll check this out at a later point).
A third area to keep an eye on is Jeto- a layer on top of a base OS. I’m not entirely sure what the material difference is however for a virtual appliance comprised of Jeto/Linux from one of Mono/JeOS…