Incognito mode only blocks local storage of data. It doesn't block IP address, downloads, referrers, or user agents. There's also some concern on if it actually

Incognito mode only blocks local storage of data. It doesn't block IP address, downloads, referrers, or user agents. There's also some concern on if it actually works at all. (See http://ask-leo.com/do_new_browser_features_offering_privacy_really_work.html http://ask-leo.com/do_new_browser_features_offering_privacy_... )