Log note :

changed:
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- Hyperbolic Geometry with Mathematica, http://www.math.uni-bonn.de/people/weber/mathematica/hyperbolic/ 

 * e.g. http://www.math.uni-bonn.de/people/weber/mathematica/hyperbolic/Links/triangle_lnk_3.html

- Spacetime Geometry, ConicSections, Tensorial, Complex Function Graphics,Rotations and Euler Angles etc. etc.

 * http://home.earthlink.net/~djmp/Mathematica.html

- Some Nice Pictures of a Hyperbolic Tiling of the Poincaré Disk

 * http://library.wolfram.com/infocenter/Demos/148/