I presented a quick overview of SystemImager, how it works and typical use cases, at the LinuxDay 2008 in Ferrara. The slides are available here. There are also some nice pictures of the event.

After my talk Andrea Arcangeli presented an interesting talk about recent core kernel features (expecially mmu_notifier), that makes KVM to reliable swap guest mapped pages (without a mmu_notifier pages mapped in secondary MMU are pinned and cannot be swapped), perform balooning and save host memory with KSM (map different virtual address to common pages shared between different VMs).