Steve Martin never ceases to amaze me—sometimes by his audacity, sometimes by what he chooses to do (any number of recent movie projects illustrates this point, although our culture's current resistance to good film-making is not his fault). I digress, however—this is powerful, honest writing and I feel better for simply having read it. You go, Mr. Martin.
Scott Berkun has written a nice essay on writing—or more specifically, on overcoming writer's block. He leaves out the one that usually works for me: Work for an editor you don't want to disappoint. Of course, spending the money before you get the check works, too—although apparently not for everyone.
Robert Benchley said that a freelance is someone who gets paid by the word—per piece or perhaps. My problem isn't so much getting paid, but buckling down and getting the job done. BadLanguage.net has a list of 10 stratagems to do just that.