Presentations
The following are presentations that have been done about various shellcode:
http://www.purehacking.com/dnsshellcode/src/Reverse%20DNS%20Tunneling%20...
http://www.blackhat.com/presentations/bh-europe-06/bh-eu-06-Cerrudo/bh-e...
http://www.gi-ev.de/fachbereiche/sicherheit/fg/sidar/dimva/dimva2005/mat...