Send self-destructing IMs

I don't normally type anything that would embarass me if I saw it on the front page someday, but some folks use IM & e-mail in a much different manner.

Send self-destructing IMs : Gina Hughes : Yahoo! Tech:
". . . IMs don't disappear, and for the most part we all have to be careful about what we say over email or IM, especially at work. The good news is there are services out there that allow people to send both self-destructing emails and IMs. I told you about the self-destructing email services before, and Bigstring, one of the companies mentioned in the article, is now also offering a self-destructing instant messaging service.
. . .
Once you sign up for an account, you can send other Bigstring users IMs or pictures that will literally self-destruct right before their eyes. These IMs can not be copied, logged, or screen-printed, and the company says once the message disappears from the screen, it is gone forever. Copies of the message are not saved on any server.

Features on this IM client are very minimal. You can choose how long you want your message to be displayed on the screen, you can set your online status, and you can turn off sounds. It's web-based, which means you don't have to install anything on your computer, but you can download a plug-in to your AIM account."