http://startpanic.com/
quote:
Originally posted by http://www.ghacks.net/2009/04/25/internet-privacy-start-panic-tells-you-where-you-have-been/
Start Panic tries to raise public awareness for Internet privacy issues on their website. They have implemented a script that will gather information about previously used websites from the user’s web browser. Two aspects make this interesting. The first is that it is a cross-browser solution. It works in all major web browsers including Microsoft Internet Explorer, Mozilla Firefox, Opera, Google Chrome and Safari. The second aspect is that it will display results even if the user clears his web browser’s history, cookies and cache regularly. The current browsing session is recorded normally in all web browsers which usually have options to automatically clear these traces on exit only.
EDIT: I did a quick Google, and found
this (read the comments). So that kinda explains it...
/ 
How the heck does this work? (Start Panic)
