USB-powered laptop light

I've been using the Nite Key Lite, a USB-powered laptop light, to type on my iBook when I've got my baby sleeping next to me at night. The light's mounted on an 18" stiff bendable cable, and has two bright white LEDS that shine a bright spot on the keyboard (I wish the illumination was a little more diffuse, but it's not a big deal). It doesn't seem to drain the batteries quickly (the manufacturer claims it "draws no more power from a notebook battery than 90 seconds per hour of laptop life.") Seems like it would be useful out in the field, or wherever AC power is unavailable. $20. Link Discuss