Movies? Serenity.
TV Shows? If stations count, Babylon 5. If they don't, the Andromeda Ascendant.
Books? I don't remember the name of it, but it's in Exiles to Glory by Jerry Pournelle - it's a water tank that the heroes make modifications to (so they can escape the asteroid they're marooned on, and get to the main asteroid base). I also like the Lunatic from the Star Wars expanded universe: It's a smuggling compartment (like the one in the Millenium Falcon) with a rocket engine and R2 unit attached to it, used for temporary travel.