Software Visualization at Georgia Tech
Dark Soliton Simulation Gallery (U Iowa [a Soliton is "a wavelike solution to a nonlinear differential equation that maintains a constant shape as it propagates' (Academic Press Dictionary of Science and Technology); "an isolated wave that propagates without dispersing its energy over larger and larger regions of space" (McGraw-Hill Encyclopedia of Science and Technology 16:653)]
Complex Systems (ANU--from the Bioinformatics Faculty. A nice introduction to dynamic[al] systems/chaos in biological contexts, with many illustrations)
Boston University Center for Polymer Studies (Fractals in Nature)
Fractal Gallery from fractals.com
Space-Time Travel Machine (various chaos visualizations)
Chaos, Complexity and Nonlinear Dynamics Sites
Collaborative Modelling and Visualization at Purdue
Lab For Scientific Visual Analysis at Virginia Tech
Peek: visualizing >3 dimensions (Gordon Kindlmann at Cornell)
Henri Poincaré --a nice summary from U. Maryland