In this video, Professor William Murray demonstrates advanced integration techniques for AP Calculus II/BC.
Educator.com

A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
Paul's Online Math Notes

This calculus integral reference sheet contains the definition of an integral and the following methods for approximating definite integrals: left hand rectangle, right hand rectangle, midpoint rule, trapezoid rule, and Simpson’s rule. There is a list of many common integrals. Also included in this reference sheet is nice table for trigonometric substation when using integrals. Integration by substitution is defined as well as the integration by parts.
eCacl.com

A very complete table of common formulas for derivatives and integrals as well as procedures. It is a pdf file document.
Paul Online Math Notes

Integration Table for trigonometric forms
http://www.cobalt.chem.ucalgary.ca

Very extensive help sheet that contains everything from simple derivative/integration formulas, to quick explanations of advanced derivation and integration techniques.
Pauls Online Math Notes

Several examples and tutorials dealing with integral calculus
Pauls Online Math Notes

Almost all of the Trigonometric Identities, including Reciprocal identities, Pythagorean identities, Quotient identities, CoFunction identities, EvenOdd identities, SumDifference formulas, Double and Halfangle formulas, and SumtoProduct and ProducttoSum formulas.
Table of Trigonometric Identities

Integral table for basic integrals
http://www.cobalt.chem.ucalgary.ca
