Evercookie will track you down, no matter the browser used
 

The Evercookie works by creating a series of linked cookies using a variety of different storage methods: standard HTTP cookies, which can be cleared from the browser; Local Shared Objects via Flash, which only operate when a Flash plug-in is installed but require a separate clean-up and which can be detected from any Flash-enabled browser; HTML5's session storage, local storage, global storage, and database storage via SQLite; cleverly manipulated page titles that store cookie information in the browser's history; and, most impressively of all, a cookie in the form of specific RGB values in an auto-generated PNG, which is forced into cache and read back using HTML5's Canvas tag.

If that list isn't impressive enough, Kamkar is also looking to add more vectors to the list, including Silverlight's Isolated Storage and HTTP ETags.

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