LIFE Magazine collection of logos painted on boxcars.
Steven Heller interviewing the man behind the O, the most incredible thing to happen to presidential campaign design since the color blue.
Sagmeister's charm seems to me to lie in his tenacious devotion to high-concept design and execution. See here how he's made it possible and even interesting, for a building's shape(s) to also be its logo. See also, of course,
that poster.