I converted to Ubuntu about a year ago now, and the first thing I did once I discovered how good it was, was to share it with my family, once the whole household had converted I showed my friends. I have now helped over 20 people convert over to Ubuntu.
It was easy just wait to they get done yet again by viruses and say to them "Just bring it around I will put on Ubuntu instead and you will never have a problem again"
I love the fact everything is free and I feel the best way I can do my bit to help is show it to others.
My wife now calls me the "Ubuntu Evangelist"
now that Ubuntu has reached the magical 1% we have enough critical mass that if we all do our bit we can edge past osx to be the number in no time.
Are you a closet Ubuntu fan or a Ubuntu Evangelist?