I have some nice resource here helping to understand how to quickly test shellcodes in a C code, how to build shellcodes from a C code , etc , very interesting work which I thank all respective owners.

[TXT] (http://heapoverflow.com/pap3rs/designing_shellcode.txt) the_swede
[PDF] (http://heapoverflow.com/pap3rs/egghunt-shellcode.pdf) skape (metasploit)
[PDF] (http://heapoverflow.com/pap3rs/intro_to_shellcoding.pdf) Michel Blomgren (tigerteam.se)
[ZIP] (http://heapoverflow.com/pap3rs/kungfoo.zip) Steve Fewer (harmonysecurity.com)
[ZIP] (http://heapoverflow.com/pap3rs/shellcode2.0.zip) Delikon (delikon.de)
[HTM] (http://heapoverflow.com/pap3rs/shellcode.html) Steve Hanna (vividmachines.com)
[TXT] (http://heapoverflow.com/pap3rs/shellcode.txt) Samy Bahra (kerneled.org)
[TXT] (http://heapoverflow.com/pap3rs/Shellcodeadvances.txt) sk (groundzero)
[PDF] (http://heapoverflow.com/pap3rs/The_Basics_of_Shellcoding.pdf) Angelo Rosiello (rosiello.org)
[PDF] (http://heapoverflow.com/pap3rs/unicodebo.pdf) Chris Anley (ngssoftware)
[PDF] (http://heapoverflow.com/pap3rs/win32-shellcode.pdf) skape (metasploit)
[PDF] (http://heapoverflow.com/pap3rs/win32-simple-shellcoding.pdf) Delikon (delikon.de)