New completion mode

[Lars Magne Ingebrigtsen <larsi@gnus.org>]

Has anybody written the completion mode I twittered about a few years
back?  That is, kinda like what Firefox does when you type in an URL?

I may be slightly feverish, but the thing might work thusly in Emacs:

You're on an address header:

  To:

and you type

  To: la

Emacs would then show you the possible completions, ranked in the
most-likely order.  (Likelihood might be based on number of times the
address has been used, and how recently it was used, and perhaps
other... things.)

How to display the list, though?  One possibility would be in the echo
area.  Just display the ten most highly ranked ones, and choose them
with, say, `M-n M-n RET' or the like.  Or pop up a small helper
buffer.  Or a frame?

Or has anybody written this already?  Does bbdb do this?  Perhaps I
should have a peek...

When does this list come back to life again?

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@gnus.org * Lars Magne Ingebrigtsen