Jackie Huba has this interesting post on the critical differences between customer and corporate evangelism.
Corporate Evangelism is very different from traditional sales teams companies are used to building or having.
Customer Evangelism
Customer evangelism is the payoff for organizations that focus on the loyalty of their most passionate and demonstrative customers.
Customer evangelist
* Spreads the word
* Recruits new customers
* Helps you improve products and services
* Defends you
* Supports you
But, what does "loyal" mean?