I ran across this tool not long ago. It doesn't anything one can't do via other means, but it does it faster, doesn't require doing a bunch of scripting, puts all sorts of useful information in one screen and can export to a spreadsheet. One of the things I use it for is finding what VM's have old snapshots sitting around. I also used it the other day, when I was deleting old ISO files from a datastore, but couldn't as it was locked. A VM had it mounted, but which one? With this tool I was able to goto the CD rom tab and quickly scan to find the offending VM.