This is a great tool that allows you to compare and edit\copy\move files in directories. I use it a lot for keeping builds up to date across regions and between my development build and working build. Very handy tool and worth the small cost.http://www.scootersoftware.com/
I concur. We, like you, keep a development workspace/dataset that sometimes becomes too different from the active company workspace/dataset. BeyondCompare has helped tremendously to rectify this situation.