Just wanted to drop a note to say that admins can, indeed, make edits without a notice appearing (though not to their own posts, IIRC). I've used it here many time to fix super-egregious spelling errors in topic titles, for both a petty reason (it bugs me to see them on the home page again and again) and for a good reason (future searches for a topic will never turn up the misspelled word unless you misspell it in the search).
I feel evil and sneaky doing it sometimes, but never bad. :)
-- Matthew
Hey, why don't you use the 'List all new posts' link on the main page.. That's what it's there for.
-Darke