tedster - 7:34 pm on Dec 19, 2010 (gmt 0)
I've been having a ball with it. For example, compare Plato and Aristotle [ngrams.googlelabs.com].
Aristotle references definitively passed Plato references in the 1950s when Bertrand Russell became the big philosophy "star" - and he hated Plato.
Another fun play - Joomla versus Drupal [ngrams.googlelabs.com]
And finally, Danny Sullivan warns [searchengineland.com] about the challenges for OCR posed by the old style "medial S" which looks like an "F"