As of 2013-08-29, pedestrian development has been officially retired (as opposed to unofficially up to this point). It's a decent tech demo, and a good place to start if you're interested in seeing a working Slick2d project, or want to see how one might implement exponential resistence-based turning and avoidance systems, but my plans for pedestrians itself (and projects based on similar ideas) have changed in the last month.
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Pedestrians is a simulator for pedestrian movement. It's fun, it's light, it's a tech demo at this point.
As of July 2011, the project has been in development for barely more than a month. Here's a basic rundown of what the project currently does: