More Great Stuff:
Andy Sernovitz | Damn, I Wish I\'d Thought of That!
Damn, I Wish I\'d Thought of That! – Andy Sernovitz Blog – Unusually Useful Ideas for Smart Marketers. A great, practical blog that will help you use word of mouth marketing, social media, viral marketing, blogs, buzz, evangelism, and more.
1. Ask them to.
2. Give them ready-to-paste graphics.
3. Give them ready-to-paste text.
Great examples from BlogHer and Blog Business Summit.
Lesson: If you want word of mouth, you need to make it easy, easy, easy. People are happy to talk about you, but not if it’s going to be a big hassle.
Learn to be a great word of mouth marketer.
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You can have amazing word of mouth, and I can help you do it.
My book, Word of Mouth Marketing: How Smart Companies Get People Talking, is full of practical, how-to tips on how you can get more people talking about you tomorrow. Book site | Amazon
My keynote speeches about word of mouth marketing and social media, will leave your group energized, educated, entertained, and enthusiastic about the power of word of mouth.
My companies:WordofMouth.org: 
Learn to be great at word of mouth marketing.
SocialMedia.org: We're the community for social media leaders at the world's greatest brands.
Andy, I think your lesson here is an important one. Enablement is definitely something we tend to overlook and underestimate. We must make it as easy as possible for people to talk and spread our message whether its an event, product, or personal brand.
Making it easy to do encourages viral marketing. I will be integrating this into my websites and blogs for now on. Thanks Andy!
Flow Festival here in Helsinki did just what you described.
They sent an email to all newsletter subscribers with a ready-made text and a link to their forum-friendly image.
I was so impressed I even blogged about it:
http://www.facade.fi/?p=32