【精】iOS在线开发教程
http://www.raywenderlich.com/
CoreGraphics
http://objective-j.org/learn/documentation/group__coregraphics.html
Quartz 2D Programming Guidehttp://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/Introduction/Introduction.html.
如何做市场（app）
http://www.slideshare.net/misteroo/how-to-market-your-app#
