If you are lucky enough to have an EMC backed virtual environment to work with; did you know that you can test drive PowerPath Virtual Edition (VE) for free? Go over to: https://community.emc.com/message/11590 and signup for a free 45 day trial.
This of course requires you use ISCSI or Fibre (i.e. block storage) with either VMware vSphere or Microsoft Hyper-V. But, if you have always been curious about what a truly intelligent multipathing could do for your environment, then this is a great way to give it a shot.
Also check out the information and video on Chad’s site (http://virtualgeek.typepad.com/virtual_geek/2010/09/emc-powerpathve-54-sp2-vsphere-enterprise.html). Also, you will need to have at least Enterprise level licensing of vSphere for a VMware environment.