Nothing super fancy: her digital camera; my tripod.
She wrote out the script; I set up the shots (The Girl defined the scenes, but I framed the shots); and The Girl did all the editing.
It actually turned out really well -- and reinforced my notion that someday I want to shoot a film short, as well as a few music videos.
It's somewhere in the queue.
We both had a nice time, I think. Got to spend some time together on a mutual task. :)