As exclusively revealed here last week (er, as far as I know) – Mark Mardell is the latest senior BBC journalist to take up blogging. He’s been writing a weekly ‘diary’ column on the BBC website for ages, and sought readers’ opinions on whether to stick with that format, or switch over to a proper blog. The practical difference is pretty minimal, with Mark even promising to keep up his practice of a ‘regular column’ on a Thursday. (Thanks to Aaron for the tipoff.)