DJing outside is cool.
Please, someone send me some of these. The stylish red version managed to power my amp, speakers, main cd players, DiscMan, and MiniDisc recorder for more than two hours! There's something amazing about getting power from batteries: no generator noise. Three or four deep cycle batteries are definitely being added to my toy list.
After that battery (clandestinely borrowed from the Midnight Sun Solar Race Car Team) ran out, we strung together the world's longest extension cord and ran it to my car. (Phil would now no doubt point out the evils of power chaining.) I did a bad thing and let my car battery go down to 10.39 volts. It started fine, but such a deep cycle is not exactly a great idea. I will surely pay for my summer excesses next winter.