There is an interesting article on church and web 2.0 on articlecity. It focuses on using the web to forward to the aims of the church, primarily Matthew 28.

Given the Great Commission all Christian churches are tasked with, utilizing these tools is critical, as any means of exponentially increasing your listener base should be. To follow is a short list of features which should be utilized in your current church website design, or used as a checklist for commercially available systems.

The article then ends with a glossary of web 2.0 phrases.