Save the ID and title (or description) of your current Pivotal Tracker story
with M-x set-current-story (you have to add these yourself; does not integrate
with Pivotal Tracker.
Insert [#story-id] (and display the story title in the minibuffer) with
M-x insert-current-story.
Display the current story’s title with M-x current-story.
That’s it.
It’s on http://marmalade-repo.org, so you can M-x package-install current-story
and then, in your init.el:
(require 'current-story)