We have been working for a while now behind the scenes on a VM Management control panel for Linux-KVM primarily, however will support Xen, OpenVZ and VMware as well in the near future.
If you're interested in beta testing please email me and I will contact you when our beta program is ready.
For the rest, what features would you like to see in a typical management panel. We have most of the basic functionality implemented, however we would like to hear what you have to say. Any feedback (including pricing structure) regarding this would be greatly appreciated.