I think every long-distance couple should have this:
"Pillow Talk is a project aiming to connect long distance lovers. Each person has a pillow for their bed and a chest sensor which they wear to sleep at night. The chest sensor wirelessly communicates with the other person’s pillow; when one person goes to bed, their lover’s pillow begins to glow softly to indicate their presence. Placing your head on the pillow allows you to hear the real-time heartbeat of your loved one.
The result is an intimate interaction between two lovers, regardless of the distance between them."