about:version - obviously version information (also accessible by chrome-resource://about/)
    about:plugins - obviously installed plugins
    about:histograms - hey I love this one! don't quite know what this all means though
    about:dns - obviously just some DNS stats
    about:cache, redirecting to view-cache: - list of cached documents, each viewable in HEX!
    view-cache:stats - stats for cached documents
    about:stats - obviously just some stats
    about:network - that's an awesome tool!
    about:internets - oh, an Easter Egg of a kind? look at the page title - The Tubes are Clogged! )
    chrome-resource:/new-tab/ - heh, a template for the empty tab page?
    chrome-resource:/favicon/ - even favicons look like this in the Matrix
    chrome-resource:/thumb/http://www.saulis.com/ - this one generates the page thumbnails for the empty tab page
    about:memory - nice memory stats
    :% - yes, just this little bit crashes the browser, so don't try it unless you want to loose the opened tabs
    about:crash - will display the default crash page banner