In this day and age, having an understanding of computers and how they work, is important. It can also lead to better understanding of everything from math to science. One thing to remember, computers are built off of If Then, or binary functions. If someone clicks this button then that happens. When programming the same thing applies, I always think of programming like file folders withing file folders. I pick up a file on my oldest DS. The first thing in the file is a picture of my child. N the back is his dossierre - birthday, weight, etc. but behind his picture are hundreds of other folders. One for every day he has lived. If I open one, there are 24 other folders within, one for each hour during that day. Within each hour folder are 60 minute folders....etc...same thing applies.
Believe it or not, even with the millions of programming platforms and languages out there. There are all pretty similar. Even if you are trying to make an app, program a game, build a robot, fix your computer. They are all similar enough that if you can do one, you can touch on them all.
I'm considering starting a Robotics club at our co-op this fall. There are some really great resources out there. There are different age categories. To be he coordinator of a Robotics Team does not mean you ave to be the 'teacher' I say think of it, instead, as if you were the coordinator. You're the person who brings those teachers together for the team.
If you are interested in starting a competition team, or want to start smaller, check out LEGO Mindstorms. They are a great teaching tool. There might even be a workshops or team in your area already.
Robotics Competition Team-
http://www.firstlegoleague.org/sites/default/files/Challenge/TeamResources/SeniorSolutions/Ch%203%202012%20CH.pdf - Starting your own Robotics Competition team
http://firstlegoleague.org/ - robotics team competition site.
My kids love their video games. There are some great free interfaces available for those kids looking to understand how a game is designed. Both of these programs are free to download and easy to use.
http://scratch.mit.edu/ this program was made by the students at MIT
http://alice.org/ this program was designed by Carnegie Melon university.