Antonio Muñoz Molina, whose blog is unmissable if you read Spanish.
This is my experience too, though I've met far fewer famous writers and artists than Antonio Muñoz Molina has, of course, since I'm not one myself. Last night I went to hear David Lodge talk at the London Review Bookshop on his new book, A Man of Parts, a biographical novel about HG Wells. I wasn't disappointed, after thirty-some years of adoring his novels. What a pleasure to sit there while he overflowed, in measured and communicative tone (the long-time university lecturer), with encyclopedic knowledge and affectionate interest in his subject.
Not my photo of David Lodge - I wish!