I just discovered Tim Carriker has begun blogging about the church and mission. While I don't know Tim personally, he was the predecessor to my Dad (Don Dawson) at the World Mission Initiative. His first few posts are intriguing and he even has a Portuguese blog of Biblical and missionary reflections. You'll have to find out how good it is on your own. I can't read it.
I hope he is able to continue building this promising mission resource on the web.