I've been contemplating the future post-Peak Oil, and I've concluded that I need to assemble an awesome indestructible bike that will last forever while the industrial resources to construct such a thing are still accessible. Even if you're a silly person who believes everything's going to keep chugging along happily, please bear with me for this thread.
I figure I definitely want a titanium frame because it'll have the strength of steel without being affected by rust, and it's also something that likely wouldn't be available anymore in the future. It'll need every mount/eyelet imaginable.
Beyond that, I don't know. Wheel/tire size? Drivetrain type? handlebar setup? What else?