I'm definitely NOT for shoving anything down anyone's throat either. I think that "getting them to use Ubuntu" could mean simply getting them set up with a dual-boot system, or maybe get it set up in a VM for them.
Totally converting people to a new OS, especially when they've been rooted in Windows for so long, doesn't happen in 30 days or less. It happens gradually and with lots of handholding until they're comfortable.
I'm confident that if the proper time is taken to show people the power and capabilities of Ubuntu (and of Linux in general), I think MOST people would be willing to give it a shot. There will ALWAYS be those who resist simply because they fear change, and no amount of preaching is going to change their minds.
So, with that being said, I propose that we all take BillyRose's challenge and seek out at least one person who you think could benefit from (or is at least curious about) using Ubuntu and try to get them to use it for at least 30 days.