hotplug is a Linux kernel subsystem that allows you to load modules and run arbitrary scripts based on events like hardware being attached and detached. It does this through a complex system of shell scripts, magic environment and map files, events triggered in the kernel, and so forth. Understanding hotplug is important since it's only going to get more widely used in later kernel versions. I gave this presentation to the GT LUG to inform people of how hotplug works. No pictures.
screen is a terminal multiplexer that provides lots of features for people who are frequently using a terminal program like xterm or are logged into remote systems. I know that's a terrible one line description, but it will have to do. I gave this presentation to the GT LUG to spread the word of how wonderful and useful screen is. No pictures.
vim is a modern version of the classic Unix text editing program, vi. It provides features that system administrators and programmers will find very useful, but remains lightweight and fast. I gave this presentation along with David Cantrell and David Shea to the GT LUG. It assumes some beginning knowledge of vim, as it focuses more on the advanced features.