This "Billion Year Contract" is purportedly the document that Scientologists committing themselves to the Sea Org (a part of the organization alleged to practice indentured labor enforced by corporal punishment) are asked to sign. It came unsourced, but there are plenty of other copies on the web, including this Operation Clambake version.
(Thanks, Fipi Lele!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.