I did my first talk over at NoVA Hackers in Reston (http://novahackers.blogspot.com) for the May monthly meeting. Was running fumes at the time, did the slides the night before with 4 hours of sleep before work, but still knocked it out. The talk is about what makes a good defensive script, and how can they be used, examples, and resources. Examples included proof of concepts I developed, Unsploitable, Defense for the blind, and Wintroll by Justin Wray, Ben Heise, and others from the http://www.teamsploit.com project.
These tools are for King of the hill style CTF's. For example, there are 30 machines on a given subnet, the team with the most flags planted at the end of the game wins.
Check out the talk.
Slides can be found here.