WikiMapper creates a historical tree of your Wikipedia browsing so that you can see just exactly how you spontaneously wasted 45 minutes and ended up reading about the history of Agriculture in Uzbekistan.
WikiMapper is available for free in the Chrome Web Store! Click here.
NEW! WikiMapper now supports browsing Wikipedia via the Wikiwand extension! When installed, Wikiwand restyles beautifies Wikipedia for you automatically.
(Comic source: http://xkcd.com/214/)
WikiMapper runs in the background and only collects page data when browsing on the wikipedia.org and wikimedia.org domains.
WikiMapper primarily makes use of the chrome.webNavigation APIs to detect and correllate browsing activity. Data is stored locally in Chrome's' localStorage.
To open the WikiMapper application, click on the 
icon in Chrome's toolbar.
WikiMapper is truly free software (MIT license) and does not serve any ads, collect any personal information, or transmit any data to anyone.