NYC Subway Map for iPhone

Now this is a pretty cool little website - iTrain is a new website that offers NYC subway riders all kind of useful information, including maps, alerts about various lines, and directions on how to get places. And best, of all, its got an iPhone version for riders on the go. Very smart - and the kind of thing that be would useful for other cities, too. Of course, I wonder whether you get AT&T reception int he subway itself? (Thanks to TUAW for the link).