网上教程

iPhone开发之Objective-C学习:

http://www.flyblog.info/catprogramming/143.html

Objective-C 2.0 with Cocoa Foundation:

http://www.cnblogs.com/yaski/archive/2009/03/27/1423083.html

macos

http://www.zhukun.net/archives/2680

http://www.mac52ipod.cn/post/Mac-OS-X-10-6-Snow-Leopard-BT-Torrent-Download.php

http://www.21andy.com/blog/20090511/1268.html