I came across some interesting tips on things to consider in a virtualized environment by Greg Shields (Consultant and Microsoft MVP). 
They are non-issues (or settled issues) on physical environments and you might overlook them when making the transition to virtual machines.

Here's a summary to get you interested:

  • Screensavers
  • Managing from the console
  • AV on VM disk files
  • Power options
  • Cluster Failback
  • RAM availability
  • Backup for CSV
  • Number of processors

Here are the links to the actual articles: