about:memory - this pages compares the memory used by all the active browsers and by Google Chrome's tabs.
about:stats - a list of internal counters and timers that has a funny subtitle "Shhh! This page is secret!".
about:network - this page could be used for I/O tracking and it's a partial replacement for the Live HTTP Headers extension. Click on "Start I/O tracking", open a web page in a new tab and you'll get a list of all the images, scripts and objects loaded from that web page.
about:internets - this is an Easter egg that references two popular Internet memes: Internets and Series of tubes. 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: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). The other tabs will continue to work and the active tab can be closed.
about:histograms - a list of histograms for Google Chrome's internal metrics.
about:dns - Google Chrome prefetches the DNS records for 10 frequently visited hostnames. This feature can be disabled in Options > Under the Hood by unchecking "Use DNS pre-fetching to improve page load performance".
about:cache - files currently in the Chrome cache
about:crash - crash the active tab. Google Chrome displays the "sad tab" image, followed by this message: "Something went wrong while displaying this webpage. To continue, press Reload or go to another page".
about:plugins - the list of plug-ins that are available in Google Chrome: Shockwave Flash, RealPlayer etc.
I hope that was informative.
Cheers and keep reading