I would like to take notes (i.e., type text), on a completely black screen with very light gray text, so as to be unobtrusive in a dark room. Further, I want a true full-screen mode -- without status bars, without menu bars, and without scroll bars -- just plain text on a blank, dark screen.
I can actually get pretty close in MS Word 2007 (for Windows) using full-screen view and a black page background. There are still scroll bars, but it's not bad. However, newer versions of MS Word do a worse job of it, not letting you remove, nor control the color of, status bars.
Windows or Mac is fine. I'm willing to pay.