From an interesting idea in gnu.emacs.bug…
How many times have you found yourself mosying thru a file when you wonder, where the heck was I just editing? Well, the best you can do is hit undo, ^F, and undo again, to get back.
… comes a very handy function in Emacs—get this elisp file and bind a key to
goto-last-change-with-auto-marks. (I bind it to F4, but of course it’s up to you.)
I note that my typical usage is a bit different from the post above: I usually remember what I was just editing, but I am reviewing a different part of the file. This feature allows me to jump back to my editing point quickly.
I must have used it so frequently that I just pressed F4 in another editor… and that’s how I realize I should share it here.
P.S. You may also be interested in this bit of advice for a slightly different experience:
(defadvice goto-last-change-with-auto-marks (before mav-goto-last-change activate)
"Split the window beforehand to retain the current view"
(unless (eq last-command 'goto-last-change-with-auto-marks)