If you happen to be registered with VMworld and missed the MySQL talk here is the replay
EA3408 MySQL on VMware: Performance and Deployment Best Practices
http://www.vmworld.com/docs/DOC-3615
One to the interesting questions that came up near the end of the talk was related to use of memory reservations for VMs running MySQL. Interested in feedback related to real world experience. One audience member found it useful in their environment.
Mike Frank's Blog 