I also polled the interwebs to see what they had to say, too.
Deb Harkness: Best: write every day. Worst: write every day. Sad, but true! Sometimes, the words are just stuck and it's better to take a walk!
Paul Greci: Best advice: Never give up. Worst advice: Don't even start.
Shelley Watters: Best: From Colleen Lindsay a month is like a minute in publishing. Worst: Publishing is luck and who you know, not how well you can write.
Maria Sweet: Worst: worst advice EVER I've been given regarding writing/publishing was to query before I finished a MS and to query even if what I have is only one chapter.
Sara Winters: BEST: To listen to the characters and not worry about everything so much. Let the first draft write itself.
Christopher Morris: Best: Write drunk, Edit sober- Hemingway.
Angela Cerrito: Best: From Markus Zusak "put something unexpected on every page", From Kathleen Duey "keep going, don't stop, be true to your story"...
Kristi Cook: I think the very best advice I've ever gotten is that the very best thing you can do for your career is to simply write more--rather than driving yourself nuts and wasting all your energy trying to promote a book, you're better served concentrating on writing the *next* book, and the next, and the next. Good writing is the best "promotion" there is.
THIS IS AN ONGOING LIST...