This was my paper that I presented at Defcon chennai meet held on jan 29, 2012. I hope you people like it.
This covers the art of fuzzing, SPIKE and also, the metasploit framework. I have also covered how to code your own exploits into the metasploit framework in this paper.
You can view the paper here: Fuzzing for fun and profit_Integrating Exploits to the Metasploit_framework