Originally posted by 1UP
That's actually generally a bad idea. If you need to move the install either make a backup of it in steam or uninstall the game / reinstall it. Alot of games when installed have registry keys that could point to file locations and when you start moving stuff you more then likely will end up with a broken game. Not to mention steam gives you the option to select what drive you want to install your games on.
If only that actually meant anything.
There is plenty of tutorials both written and video that show how to move your steam to a different drive.
All include backs ups and all are by hand. No programs like this.
This program is one that you use at your own risk. I wouldn't trust my steam account to any program/website other than something official from Valve Corp. I moved my steam install to a hdd and it worked just fine. Followed a video and a written tutorial that had pictures. :p