Chris Albritton of Back To Iraq does a bit of investigative journalism using the revision tracking features of a Word document. He can see the changes to the Mehlis report on the assassination of Rafik Hariri. Additionally, he can match up the time of the revisions to the time Special Representative Mehlis met with UN Secretary-General Kofi Annan. Several names were redacted, but it’s too late for that because the Word document Chris got still has the revision history, so it still has the names.
He’s posted the relevant section in his entry Names Deleted from Mehlis Report.