From Nordic River Software:
Compare My Docs is able to compare up to six versions of the same document to see what has been changed. Compare My Docs color codes any changes it finds between the different revisions of a document and gives you a quick and easy way to accept, reject, or set aside a change. This means you can cruise through a document and keep the changes or revisions you like, while keeping an active log of what you don't. When finished, you will have a new version that has all of those changes, which can be saved either as a Word doc or rich text file back on your hard drive.