Check out the uber-slick Giant-Ass image viewer. If you’ve seen google maps you have the general idea how this works, though it’s not (yet) feature comparable to google’s interface. This could be immediately useful to anyone modestly computer literate who needs to make large format images available over the web, and if the developer sticks with it and does everything he hopes to, this is going to end up being an enormously useful tool. I could have used this at Bowdoin on a number of projects, including The Scrolls of the Mongol Invasions of Japan site I worked on over the years.