In developing Dashboard data.

Has anyone come across a easy way to display the VM OS systems counts for each host grouping? I'd like to display those numbers in a Dahboard along with the VM overview. A breakdown of how

many VM's are either Windows, UNIX, Linux,etc,etc. Kind of the way when you look at the Domains and go under infrastructure and it's broken down by service for each host grouping. Just trying to create a ESX/VM overview totals Dashboard.