'about:net-internals' gives an overview of network status and usage. 'about:memory' gives an overview of chrome memory usage, by tab and in total. It will also give data for other browsers if they are open. 'about:dns' lists stored dns data. 'about:plugin' lists all the plugins that chrome is using (such as Flash or QuickTime). 'about:cache' gives all the items in the browser cache. 'about:sync' gives bookmark sync data. 'about:histograms' gives low-level performance data (very technical). 'about:version' gives a detailed version page with the Chromium, WebKit and V8 builds currently being used and user agent info. 'about:credits' lists the (open-source) software and API's that Chrome uses and links to their respective websites. 'about:about' lists all of chrome's about pages. 'about:flags' allows you to enable/disable experimental features.