After a friend reminded me of Johnathan Coulton's original songs, I looked him up on YouTube and these are the ones I recommend. These are definitely written for the techie/gamer/scifi Fan. Now my kids are singing them.
Code Monkey:
http://youtube.com/watch?v=v4Wy7gRGgeA Skullcrusher Mountain:
http://youtube.com/watch?v=2_ryNJVreiY(The video on both of these is made by fans from WoW footage)
Re: Your Brains ...
http://youtube.com/watch?v=AjcH2UmK1uo(live performance)
He uses a creative Commons License to allow fans to make videos as long as they give attribution. Way cool.
Cheers!