Below is a list of links that may be helpful:

1. Eric Weisstein's World of Mathematics - Geometric Probability
   
   
2. Cut-the-Knot - Buffon's Needle Problem
   
   
3. Buffon's Needle - an Analysis and Simulation
   
   
4. Buffon's Needle
   
   
5. The Shodor Education Foundation - Buffon's Needle
   
   
6. The Geometry Junkyard