AYL (TM) Portable Mini Speaker System for PC / Phone / Tablet / Apple iPod Touch / iPhone 4 / iPad / MP3 Player (Red)
It arrived and I thought:  Wow...that's *really* small!  I plugged it into a USB source to charge, and while it did, I hooked it to my iPhone, playing Pandora.  I was completely surprised....it was amazingly loud, and it sounded quite good.  So, lightweight, inexpensive, good volume, and pretty impressive sound.  I don't know whether it will hold a charge for long, or anything about whether it will \\"last\\", but I think it's a winner.