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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: Melbourne, Percentile, Jimmy_Wales, Danny_La_Rue, Buckingham_Palace, Paget's_disease_of_the_breast, Racketeer_Influenced_and_Corrupt_Organizations_Act, Buckingham Palace, Main_Page, The_Girl_from_Ipanema, Hacker_ethic, Visible_spectrum, Deaths_in_2007, Super_Bowl, Rita_Guerra, Tour_de_France, Hillary_Rodham_Clinton, Barack_Obama, Maywand_District_murders.
Plots being processed: Edgar_Wind, Temporal_information_retrieval, Paulo Portas, state_of_wisconsin, narendra_modi, Godspeed_You!_Black_Emperor, Rick_Astley, Tour_de_France, enterprise_resource_planning, steve_fossett.