This advertisement won The Linux Foundation‘s recent video contest:
It’s well done and definitely the most suitable entry for a general audience.
I felt that the other entries were targetted more at people who are already using Linux (who know the jargon and the in-jokes).
Related posts:
Couldn’t be bothered emailing you but wanted to let you know about this place if you don’t already…
http://www.osalt.com/
Open Source alternatives… Haven’t had a chance to look yet, but seems like it’d be right up your alley.