Flat, adhesive-backed speaker wire you can paint over

Taperwire is a flat adhesive-backed speaker-wire that you stick to your walls and paint over:

No drilling necessary. Just press Taperwire on the wall and attach your speakers and sound system. Hidden by paint, wallpaper or spackle, this paper-thin wire will go unnoticed. You can even lay it under carpets—no bulges!

Link (via Red Ferret)