good things on internet

design patterns
en
http://download.csdn.net/source/179573
cn
http://download.csdn.net/source/538364

refactoring
en
http://download.csdn.net/source/1671066
cn
http://download.csdn.net/source/322582 all
http://download.csdn.net/source/339292

source http://download.csdn.net/source/1603751

Working Effectively with Legacy Code
en
http://download.csdn.net/source/251356

C Programming FAQs
cn
http://download.csdn.net/source/1782301