There are lots of secret about pages in Google Chrome which you access by typing their URL in addressbar and press Enter. All known About pages atm are as following:
And at last, in Google Chrome, pressing Ctrl+Shift+N will open new incognito window. Pages you view in this window won't appear in your browser history or search history, and they won't leave other traces, like cookies, on your computer after you close the incognito window. Any files you download or bookmarks you create will be preserved, however.
Learn more about incognito browsing.