Not usually my thing, but here is a link I saw this morning to a wood-gas burner. Cool!
(broken link removed to http://www.cnn.com/video/#/video/us/2011/06/02/dnt.wood.powered.truck.cnn?hpt=hp_t2)
(broken link removed to http://www.cnn.com/video/#/video/us/2011/06/02/dnt.wood.powered.truck.cnn?hpt=hp_t2)