How do you erase the revision history of your MS Word (2007) document?

There is a walkthrough for Word 2003 here.

And for Word 2007: "How to quickly and easily remove meta data"

There's MS tool called Remove hidden data for Word 2003.

Here's how to remove it from Office 2007 documents.

Another way if I remember correctly is to save document as rtf then save again as doc.