"The Iraq War: A Historiography of Wikipedia Changelogs" is a twelve-volume set of all changes to the Wikipedia article on the Iraq War.
The twelve volumes cover a five year period from December 2004 to November 2009, a total of 12,000 changes and almost 7,000 pages.
Quite possibly the last item on the giant list of all books I'd someday like to own, but I find the idea of it oddly compelling.
You can go look at digital photos posted online, of books containing nicely-formatted renderings of various versions on a particular page on the Web, here.
[Added] Another rave review for James Bridle, creator of the above. And here's a link to his page in the brochure for the conference, as it were. Damn. Sounds like the rest of us really missed a good talk. Hope they taped it.
[Added2] See also James Bridle's blog booktwo.org.