Several links and examples of mathematical beauty.
The romp through Calculand is calculus, text-based gaming, and real / virtual - world math, all rolled into one...
Excerpt: "If the dog's three heads move simultaneously and the velocity is given by the function 0.5x^3 - 3x^2 + 0.25x + 5 m/min. Find the following to help our young man escape the underworld in under 10 minutes or he could die: When are the heads of the dog not moving?"
Other links: a nice course / tutorial on Mathematics in Art and Architecture, and ruminations on fractals and Jackson Pollack.
Discovering Prince of Calculand
Mathematics in Art and Architecture
Mathematical Melodies: The Beauty of Numbers