http://en.wikipedia.org/wiki/Wikipedia:Lamest_edit_wars for the data. Not sure where to get the edit counts, aside from checking the history statistics.
Battle!
More than 40 reverts in one hour by two editors. The point of contention? Whether "Angels & Airwaves" is a band or "Angels & Airwaves" are a band. (British English requires "are," as the band comprises multiple people, while American English requires "is", as the band is a singular entity.) ALL-CAPS edit summaries laced with profanity and death threats liberally employed by one side. Stopped only after admin intervention, but resumed again two minutes after the 3RR block expired. Both get blocked for seven days, and one of them gets his block extended to eight days after stating he doesn't care as long as the other side gets a block of same length. The other side keeps his seven-day block.
I was the admin in that case. It was my proudest moment in all of Wikipedia adminship.
Reading the actual "discussion" is both hilarious and depressingly frustrating. The Alex 101 user had to have been trolling, 'cause, I mean, come on.
For a better (or at least more varied) selection of infographics I like:
* Chart Porn (http://chartporn.org/)
* Flowing Data (http://flowingdata.com/) which also covers datavis software
* Information Aesthetics (http://infosthetics.com/)
* We Love DataVis (http://datavis.tumblr.com/)
(edit: formatting)