Ask HN: Any way to invalidate cookies?

In GMail, you can log out other sessions if you're logged in. At the very bottom, it says something like "Last account activity: xx minutes ago ..." followed by a Details link. Click it and you'll see the button to log out everyone else but your session.

Otherwise, I don't think so and am watching this thread to learn.

change your password ... ( all of them ) And next time use: http://www.truecrypt.org/

Sounds like a product. Remote Cookie Destructor.