This is an absolutely top hole idea. Let me just say that if the Holy Father needs an editor/dogsbody for his blog, I'm happy to oblige ;-)
Fr Z suggests that some of the Bishops were asking their neighbours "What's a blog?" You could imagine a Private Eye style dialogue:
Mr Justice Cocklecarrot: What is a blog?The Curt Jester has a fun post up about this too: Blogger of the Universal Church. He has this picture and caption:
Counsel for the prosecution (Messrs Sue Grabbit and Runne): A blog M'Lud, is a series of articles posted on the internet in reverse chronological order
Mr Justice Cocklecarrot: What is the internet?
Counsel for the prosecution: The internet M'Lud is like a series of tubes ... (etc ad nauseam)