This site only launched 1.5 years ago and I put this link here as yet another resource you may find helpful in learning calculus. Wolfram|Alpha is also available as a ipod touch/iphone app for $1.99.

Optimization - Soccer 4.7 Investigate the optimum position on the soccer field to score a goal. Optimization - Elvis the Dog 4.7 Elvis the Calculus Wonderdog! Newton's Method 4.8 A dynamic ...