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WikiChanges is a web-based tool that exposes the revision history of Wikipedia articles using an interactive graphical timeline. See About for more information and a Greasemonkey script to embed timelines in the real Wikipedia.
Last 20 plots: Social_network_analysis, Guta, Jean_Monnet, Genghis_Khan, Heart_Sutra, Colon_classification, by, Zine_El_Abidine_Ben_Ali, Hillary_Rodham_Clinton, Barack_Obama, Standing_Rules_of_the_United_States_Senate, World_citizen, Carleton, Mahmudiyah_killings, Complex_systems, Gareth_Porter, 2004_Indian_Ocean_earthquake_and_tsunami, Standing_Rules_of_the_Senate, David_LaChapelle, Gita_Sahgal.
Plots being processed: Godspeed_You!_Black_Emperor, Tour_de_France, enterprise_resource_planning, Rick_Astley, steve_fossett.