Online discourse has become harsh and unhealthy. This is especially true of political discourse. John Mark Reynolds, public speaker and director of the Torrey Honors Institute at Biola University, will address the problems of internet discourse and what bloggers can do to raise the level of conversation on the internet.There is a lot of good advice here.
Reynolds blogs at The Scriptorium Daily. He is an outstanding model of thoughtful blogging.
You can also check out the first two chapters (by Reynolds) in the book, The New Media Frontier: Blogging, Vlogging, and Podcasting for Christ.