Engadget - If it never occurred to you to plug all kinds of peripherals into your ear cans -- including the media player making the sound -- a new patent from Redmond's brain trust might give you pause. The headphones are shown as a catch-all, with receiving spaces for snapping in devices like rechargeable battery packs, storage, Bluetooth or WiFi reception modules and media players -- such as the Zune-like one sketched in above. (Audio, Microsoft)