clipped from www.readwriteweb.com

On the internet, data lives forever. Once you post something to the web, you see, you simply can't take it back. Many people have had to learn this lesson the hard way, unfortunately, after discovering that the "delete" button doesn't really work to delete something from the internet as a whole. The embarrassing missive lives on and on, in the web service's archives, in Google's cache, and eventually in the Internet Archive itself.

That may be about to change, though, thanks to a new tool created by researchers at the University of Washington. Called "Vanish," the system places a time limit on any message posted to any web service through a web browser.