
A new feature in Ubuntu 8.10 is the ability to launch a temporary guest session. This lets a person borrowing a computer perform actions such as logging into a Web page without disrupting the main user's log-in credentials. It's also easier to fire up a guest session than to create an entirely new user account.











See http://www.ubuntu.com/testing/intrepid/alpha1
It helps to have the right topic... I guess its safe to say you personally haven't tried it yet? :P
In other news, Canonical is letting us brainstorm ideas on brainstorm.ubuntu.com, so anyone with good linux ideas should consider contributing.