For anyone looking to learn more about PowerCLI or VI Toolkit I can highly recommend watching the PowerCLI – What is new in PowerCLI by Carter Shanklin on VMware’s coffee talk webinars page here >>http://is.gd/Op6J
For me this session was fantastic it really opened my eyes to some of the more advanced methods of getting data using PowerCLI, there are a number of commands that will assist you in day to day troubleshooting techniques.