This post will initially have a limited audience--residents of New York City--but I think the idea behind it is interesting enough that other folks might benefit as well. Khoi Vinh has whipped up a cool NYC subway map for the iPhone
that takes advantage of the iPhone's thumbnail system for photos. Basically, he's cut up the MTA subway map in such a way that you can pan across the map with the forward and back buttons. The map tiles also overlap a little bit on all sides to make panning more natural. So taking this idea, apparently originally borrowed from Mike Essl, I figured other iPhone aficionados might well whip up similar maps for their own particular circumstances.