If hydrogen powered lift trucks are not yet on your radar, now would be a good time to start monitoring them. Still in the developmental stages, hydrogen fuel cells are being tested by companies as diverse as General Motors, Wal-Mart, FedEx and others. The technology is emission free, eliminates lead acid batteries and related concerns, and can be refueled relatively quickly. But that's only the start. For a full white paper about fuel cell technology from the Industrial Truck Association ( www.indtrk.org), send an e-mail to wjmontwieler@earthlink.net.