So who all is headed out to the playa this year? I'll be in Videogasm www.videogasm.com/burningman/2001, so stop on by. Re: battery setup, for the '98 Burn we built an "Alien Karaoke", 4 speaker, two channel sound with strobes, black lites and xmas lites. Two truck batteries provided all the juice we needed for a few hours of use and this thing is *loud*! I got a used 4 ch car amp on Ebay for $40, it cranked 30W/ch into two 5 1/4" and two 8" speakers. The whole thing is based on a toy wagon with built up sides, so it's fully mobile. I built a small 12V preamp with a generic op-amp circuit. The preamp has two stereo inputs and one mic input. I usually use premade CD's or tapes, but can improvise live with a Korg Pandora and a sampling keyboard.