I just launched APCalcRef, here's the description:
A comprehensive AP Calculus review app written by a Math PhD. Functions, Limits, Derivatives and Integrals are all covered with clear examples. For quick access to equations, the “Equations” tab displays commonly used properties and equations for derivatives and integrals.
* Covers topics as specified by AP Calculus curriculum
* Comprehensive coverage includes 55+ worked examples
* Includes convenient “Equations” tab
* Written by Math PhD with experience teaching college Calculus
The iPhone version is coming soon. For more info, check out apcalcref.com
Thanks for taking a look. Feedback welcome!