I had written earlire about defragmentation and making your hard disks as fast as possible. However I have not seen a tool like Invirtus Virtual Optimizer. It literally chops chunks of your virtual hard disk with its optimization engine.
I came across it based on mails from other Microsoft Regional Director colleagues who were raving about it.
I tried it on a 11+ GB virtual hard disk I had, and it reduced it to 7+GB that’s almost a 36% decrease in size which is huge… I’m sure it will vary with each experience, but I’m a very happy man.