Am currently testing VMturbo from www.vmturbo.com – its a tool to allow you to see your capacity planning issues with your vmware infrastructure.
Primarily the areas it covers are
– Infrastructure monitoring
– Problem detection
– Performance Reporting and Alerting
– Capacity Reporting and Alerting
There is a community free edition – which has the above features but lacks the more advanced options of the paid for version. Worth kicking the tyres on this one – it manifests as an ovf whch you download and install to an esx and then it can be pointed at a vcentre host to get the lowdown on the virtual machines. More about this tool once its had a chance to do some monitoring.