stupid advice on writing

At the risk of offending practically everyone on the planet, I am nonetheless going to post a short list of advice on writing I have heard at conferences which I now think is useless:

1. You must print your document out in Courier 10 pt with 1 inch margins all around, using underlining to indicate italics. (I know one sf author who insisted on this, and for years I followed it slavishly, only to discover that no editor I ever met cared if you printed your manuscript in Times Roman, and most pr...