UltraCell's UC25 / XX25 two-day laptop fuel cell

We've been hearing the siren's call for fuel-cell laptops for what already seems like too many years now, but we'll admit nothing whets our appetite like the promise of two day run time, which is exactly what UltraCell claims they're showing off in their UC25. It's only a pre-production model designed for military purposes right now, but UltraCell apparently had it going on at IDF in SF this week, and hopes to commercialize their products by the second half of this year. Hot, as always, but until we've got them powering our respective Vaios, PowerMacBooks, and OQO / UMPCs, we're gonna have to continue wearing the skeptic's hat and hoping for a real product and not just a whole lot of hydrocarbon-free smoke, so to speak.