Core77

In hotel rooms, I often wish for a stereo to connect my iPhone to; buying portable speakers is one solution, but that would be one more thing I'd have to carry and plug in to a dwindling supply of outlets.

Griffin's AirCurve is one more thing you'd have to carry, but not (neccessarily) plug in. The non-electronic device is essentially an acoustic amplifier, using "a cleverly designed coiled waveguide that collects the sound from the built-in speaker of your iPhone, amplifies it, and projects it into the room."

The AirCurve only runs $19.99. Also, since it looks like a dock, it acts like a dock; you can plug in the cable that came with the phone to charge it. Which reminds me of the other thing I often wish for in hotel rooms: a power strip.