You've gone incognito. 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.
Going incognito doesn't affect the behavior of other people, servers,
or software. Be wary of:
• Websites that collect or share information about you
• Internet service providers or employers that track the pages you
visit
• Malicious software that tracks your keystrokes in exchange for free
smileys
• Surveillance by secret agents
• People standing behind you
Learn more about incognito browsing here:
http://www.google.com/support/chrome/bin/answer.py?answer=95464&hl=en-US