This person has created a site that show how a document was created - letter by letter, deletion by deletion! Whilst this might be tedious, used appropriately it might show the editing process clearly. You can do an analysis of keystrokes - when and how many.You can highlight text and show how it changed over time. Man, there are some clever people out there!
Mainly for younger children but I think it would work for middle school.
The good thing about it is that each step has a link that explains the step in more detail.