I haven't seen this mentioned here, so I figured I'd post it.
http://researchweb.watson.ibm.com/history/
Fascinating visualization of the history of Wikipedia articles,
contributions, contributors, etc.
~ESP
--
Evan Prodromou <evan(a)wikitravel.org>
Wikitravel -
http://www.wikitravel.org/
The free, complete, up-to-date and reliable world-wide travel guide