Virtualisation is a hot topic again for grid services and worker node on demand
KVM, XEN, VMWARE - Everyone using different ones.
Virtualisation for cloud - Nimbus, Open Nebula, eucalyptus
the future... ??
1. plain signed virtual images transported from site to site.
2. virtual images including experiment software.
3. connecting to pilot job frameworks, instantiated with virtual images,
4. pilot frameworks replaced by commercial domain schedulers. virtual clusters.