Free web service CompareMyDocs is an easy-to-use tool that compares up to seven revisions of a Word document or rich text file to help you put together a final draft based on revisions you choose.
After choosing the documents you want to compare, CompareMyDocs will choose one and highlight areas that have been changed in other versions of the document. You can accept or reject those changes by hovering over and clicking one of the buttons that pops up. The app also has a very basic text editor built-in, so you can add, delete or do minor formatting on text within the document. After you're happy with all the changes, you can save the final version as a document for further work in your desktop word processor.
At the moment, the web app is a bit basic — which is a problem if you have more complicated documents. If, for example, it contains things like tables, images or footnotes, they may be lost or reformatted in in the process. However, for simpler documents the program is an easy, intuitive way to edit your way through a mass of revisions, and an interesting alternative to Word's built-in revision tracking.
CompareMyDocs is a free web service.