This article gives us scenarios that range from the familiar (nuclear war, divine intervention) to the incomprehensible (the Omega Point). In between are somethings that might not have caused you nightmares before, but might now! Link -Thanks, Jon Jason!
Always scary to think about it going down like that.
they have an awesome outlook, although alot of the people are a tiny bit psycho and want us all to drink the proverbial koolaid...