For fellow mac-user writer types, I've been using Omm Writer for a couple of days and kind of dig it. It's a pain if you need to keep flipping back and forth to the internets to look stuff up, but for all your haiku, dirty limerick, letters-to-hustler or similar creative needs, it's a clever way to avoid the peripheral distractions down there in your dock.
And it's free.
And it's free.