The Guardian (UK) asked a selection of writers to provide ten tips for writing fiction (Feb 2010). As one might expect, given that the responses involved a group of disparate writers, the tips ranged from the irreverent to the useful, the pissy to the pretentious. Nonetheless, they can be interesting to peruse.
"Do not place a photograph of your favourite author on your desk, especially if the author is one of the famous ones who committed suicide."
PD James suggests:
"Read widely and with discrimination. Bad writing is contagious."
There is a part II as well, with responses from Hilary Mantel (Wolf Hall) ("Write a book you'd like to read. If you wouldn't read it, why would anybody else?"), the ubiquitous Joyce Carol Oates, Will Self ("Always carry a notebook. And I mean always.") and others.