You've probably seen my other posts on this subject.

I want to be able to re-edit some entries but I need some way to know the dates entries were re-edited.

Am I just approaching this the wrong way? Should I disable re-editing of entries and use threads to follow changes by posting replies to an entry?

The only problem with that is that if I make a mistake I will have to submit a new entry to fix it. 

Thank you for your advice.