Well like my initial post was hinting at, u-boot and other "booting" methods give us two/three options tops, with a hypervisor you can have as many images of os's as you like and just pick and choose, so we could have a lot more than just maemo/meego, plus we can just shut one down and start another one up, and then flick back to the original one without having to re-boot etc. There are lot of advantages to have this rather than u-boot, whether or not the advantages out weigh the amount of work needed to create it is another matter....