Err.. you realise the overhead of virtualisation is probably a bit taxing for the poor old N900 with 256MB of RAM and "only" a 600Mhz processor? By the time you get to virtualise a guest OS's kernel that is abstracted from the host kernel, you would have filled up the entire memory space (S^3 takes around 128MB straight out of the box on the N8 and Android 2.2 taking about the same) making it thrash the hell out of the virtual memory?

By the time you run it, run another application on top, you would have filled all your memory space. The phone will be unusable from this point onwards with 100% CPU utilisation, 100% RAM utilisation and constant swapping.

The only levels of virtualisation that exists on N900 at the moment properly are the side-by-side stuff that doesnt run as an abstraction space like Easy Debian and Preenv. They both use the same underlying architecture and shared with a guest OS - more like an additional set of libraries on top of Maemo.

Until Nokia releases something better (Dual core, 1GB+ RAM) then theres very little to no hope of using virtualisation as such - hence why VMWare even dropped their mobile virtualisation project for Maemo.