I found a good place in my resume to list things like this, under Hobbies, if it makes you seem better fit to the job. Coincidentally, I applied at a VoIP/networking company and listed 'Rocket Science' amongst my hobbies on my resume, and did get the job (though I doubt much was due to the Rocket Science, but they did ask me a few questions about it (not a usual hobby). I explained how I started with flight simulators, but 'graduated' to a space flight simulator after I got bored with the regular flight sims. I explained the Space sim is more challenging in many different ways and requires plenty of understanding about numerous areas of physics, such as orbital mechanics, forces, aerodynamics.
They read this to mean that I'm ambitious, able, and willing to learn new things, and that i'm probably not too bad at math and science. I'd say it helped a little. It was a much better hobby to list than golf and poker.
Strangely, now when our bosses talk and give presentations to customers, they say "Fixing a computer doesn't take a Rocket Scientist, but we have one on staff anyway."