Free iPod Touch Apps and Games
I've already grabbed iFormulas
This useful app contains over 330 formulas, definitions, laws and properties and would be a great quick reference guide for secondary level Math classes. Algebra, Geometry, Calculus and Trigonometry are all covered by iFormulas. It won't tell you the answers, but it will provide you with the formulas you need to calculate the answer. It is like having a Math book in your pocket, so easily earns a spot as one of the top10 iPod Touch apps for Math classrooms.