The attached lisp allows moving around within a buffer or buffers to
places where recent edits or other events took place.  It has been
part of Emacs.app for a while and users have found it useful; I'd like
to propose it being added to the emacs distribution itself, probably
as part of simple.el.

Specifically, the keys M-p and M-n are bound to move forwards and
backwards through the mark history.  Also, immediately after popping a
global mark, e.g., with C-x C-SPC, then the global mark ring is used.

-Adrian