Kaleidoscope is one of the world’s best tools for spotting differences in images and text, and now it supports the ignoring of leading, trailing and line-ending whitespace too. Kaleidoscope integrates directly with Git, Subversion, Mercurial, P4, and Bazaar to fit perfectly in your workflow.
Kaleidoscope 2.1
Man, for just a second I thought you were referring to this. Mac Memories… http://kaleidoscope.net/greg/