Guide and SQLite3 Optimization Checklist

This guide has lots of great information in it about optimizing your SQlite3 database, either for mobile or desktop use.

http://web.utk.edu/~jplyon/sqlite/SQLite_optimization_FAQ.html

Helpful Use of atanf2 for rotation of sprites

This code can translate right to Cocos2d-x

http://www.pavley.com/2011/11/28/cocos2d-iphone-sprite-rotation-to-an-arbitrary-point/