*NOTICE* As of July 16, 2010 – VMware KB1024051 – has been published stating that “VMware does not support third party clustering products.”  The instructions below should not be used for any production or supported environment.
VIOPS has a good document on how to cluster the vCenter services on MSCS.  Things have changed slightly from 2.5 [...]

There seems to be a lot of confusion about vMotion and bus-shared VMDKs.  For the record, and from VMware, it is not recommended nor supported to vMotion your VM between ESX Hosts when using either Virtual or Physical mode bus-sharing.
Please see the KB here.
I know there are plenty that will disagree and have found ways [...]