Cristian’s blog

• about:version – shows the version number of the browser, WebKit and V8
• about:plugins - the list of plug-ins that are available
• about:memory - memory information
• about:stats - a list of internal counters and timers
• about:histograms - a list of histograms for Google Chrome's internal metrics
• about:dns - dns information
• about:network - used for I/O tracking
• about:crash - crash the active tab
• about:hang - type this in the address bar of a tab when there's already an active web page to hang the process (this means that the process no longer accepts any signal, but it's still running)
• about:internets - Google Chrome embeds the 3D Pipes screensaver from Windows, so you'll see it only if you have the file sspipes.scr in C:\Windows\System32.
• about:cache - a list of all the web pages cached by Google Chrome

Also you can find some under-the-hood cache details using view-cache:[URL] and the page source using view-source:[URL]