Anthony: I just noticed that if you put /tr the end of a post that it does get rid of the "edited by" in the post, but put the "edited by" in a single "non-post" at the top of the page.
Notice that there is one for you at the top.
I tried going back and adding the /tr at the end of a few of my posts above, and it just kept putting the "edited by" in the post at the top. The more I added /tr, the more it showed up at the top!