Ever since I attended a Six Apart event a few months back and was fully blogified, I have been keeping up with Rohit Bhargava and his blog, "Influential Interactive Marketing." Not the sexiest name for a blog, but much his of his stuff is easily translatable to church life and the communal aspects of blogging and online social networking.
He just posted some interesting thoughts on the "Top 7 Marketing Trends for 2007" which I think would have some interesting implication is translated well for the church.
Other post of his that is worth reading is 5 Rules of Social Media Optimization which has expanded to about 16 rules by now. Good stuff if you are getting into the whole blogging thing.
Blog on and prosper . . .