Device-agnostic and only vaguely of interest due to the lack of external iPod/iPhone controls, Grace Digital's new Eco Extreme Speaker Case ($50) is a waterproof, shockproof hard plastic box with a single 3-Watt speaker inside and a carabiner clip attached to the top. You place your iPod or iPhone inside, connect a 3.5mm headphone cable, press play, and seal the case up; a volume control knob doubles as a power switch for the case. Three AA batteries…
