So far, I've encouraged would-be-evangelo-advocates (that's you!) to enjoy Ubuntu every day, to skip the technical minutia that causes 90% of the population to cringe, to pronounce Ubuntu the same way Desmond Tutu does (oo-boon-too), to be selective when choosing an advocat-ee, to direct people towards their local community instead of trying to be an Ubuntu soloist, and to never compare Ubuntu to "competitors". Introducing my next tip...
Know it very well.
Learn about Ubuntu (the product) and become proficient at it. Learn what all the pieces in the UI are officially called. Learn what makes Ubuntu unique. What are its "crown jewels?" Look for the exciting pieces that differentiate it from other systems and learn those inside-out.
This part is important: If you are asked something specific about Ubuntu and you don't know the answer, say so. Even better, defer to the Ubuntu community, preferably the one in your city. Someone out there will know it. Don't make up answers.
If you do this, you'll be able to speak with confidence and your enthusiasm for Ubuntu will spread.
Please check back for Tip #8 tomorrow. It will be something I've learned the hard way by trying, failing, re-thinking, and then trying again.
Have you heard? We're building an Ubuntu Advocacy Kit:
"Confident Ubuntu Advocate" image CC BY 2.0 by "illustir". http://www.flickr.com/photos/alper/5122329203/sizes/l/in/photostream/