For about $60, and some sunlight (or a USB port), you can charge up most of your hand held devices (no, laptops are too big for this one).
"Once charged, Freeloaders internal battery can power an iPod for 18hours, a mobile phone for 44 hours, PSP for 2.5 hours a PDA for 22 hours and much much more."
Charges up in 5 hours of sunlight (120mA crystalline solar cells), or 3 hours of USB power. See website for more pics.
Sounds perfect for Burning Man, camping, long road trips, or just because...