VirtualBox in PHP-AJAX
code.google.com
code.google.com
StackVM (http://stackvm.com/) by pkrumins is much more interesting as a project.
EDIT: Just noticed that they do seem to have something they are calling a "detached" console. http://phpvirtualbox.googlecode.com/svn/wiki/images/phpvb8.p...
My apologies for saying its not interesting, it now is.
That means it's fine for test and home projects, but you can't base a product on it.
It is possible to purchase a license as well, although I don't think there's a public price and I dread to think what Oracle want to charge
I thought it was a desktop-only tool -- this seems to make it a viable replacement for ESX and puts it ahead of KVM in the tools department, no?
Most of the VM tools seems to miss an ability to branch a VM (i.e. take a snapshot and break it off as a seperate instance). This would be hugely useful for installer testing.
Sorry, but I'm not satisfied by a random php/ajax webinterface.