[CentOS] Virtualization platform choice

Some may be bored with the subject - sorry...

Still not decided about virtualization platform for my "webhotel v2" (ns, mail, web servers, etc.).

KVM would be a natural way to go, I suppose, only it is too bad CentOS 6 will not be out in time for me - I guess KVM would be more mature in CentOS 6.

Any experience with the free "VMware vSphere Hypervisor"?. (It was formerly known as "VMware ESXi Single Server" or "free ESXi".)

http://www.vmware.com/products/vsphere-hypervisor/overview.html

I would need a tutorial about that... For example, does that run without a host OS? Can it be managed only via Win clients? Issues with CentOS 4/5 guests (all my systems are currently CentOS 4/5).

- Jussi