While I attended the Red Hat partner summit, we had a demo of the upcoming RHEV (for servers and desktops). It was strange that while Vmware announced a beta version of VirtualCenter running on Linux, on the their side, Red Hat decided to keep the version written in .Net (from people from Qumranet, acquired by Red Hat last year). So you need a Microsoft Windows 2003 machine to manage your Red Hat Virtualization infrastructure .. are times changing ?
Of course we know that Red Hat is an opensource company and that each time they acquired a company they opensourced properly the product (Directory Server, GFS, etc ...) so we're sure that the goal is to provide a Linux version in the future .. But due to the fact that all Virtualization companies are now in a race, Red Hat didn't want (again) to wait several months (even if RHEV ETA is september). Of course we can trust Red Hat on that one .. but on the other hand , Red Hat addicted people were astonished when we saw a Windows machine with Internet Explorer. Something nobody swore it would happen some years ago ...