My family (minus my mom, she causes insanity), duct tape, humor, video games (nothing relaxes me like sniping zombies), The Escapist (I vent here), and, of course, Jesus.
EDIT: These things don't keep me from going insane as much as the keep me from going to "fun, probably-a-crazy-cat-lady-in-the-future, off-beat" sort of crazy to "hurt myself" crazy.