Here is a sweet little infographic by Cathryn Lavery that takes a look at the evolution of the Batman logo over the years. The chart takes us through the years from 1940's Batman and Robin: The Boy Wonder all the way up to The Dark Knight Rises.
The piece is described as follows:
A comprehensive and extensive chart of the Batman logo evolution, spanning over 72 years from 1940 - 2012 to map the transformation of a timeless hero. Each poster is stamped and numbered by artist Cathryn Lavery from an edition of 500.