Derivative in wikipedia (excellent!)
In wikipedia see also differential calculus
Some historical and philosophical considerations
Derivative (from Mathpage)
Tables of derivatives with proofs
Paul’s Online Math Notes (several examples!)
A derivative calculator
Applications of the derivatives
1. Functions and their graph. Monotonicity. One-one and onto functions.
2. Functions and their graph. Onto and invertible functions
3. Limit of a function to a finite point
4. Limit of a function to infinity. Asymptotes
5. Continuity
7. Derivative as rate of change: definition