OMMwriter is a MAC program that simply takes over the entire monitor and furnishes a minimalistic, zen-like environment. This one's really helped me focus for several weeks now.
Dark Room is the Windows equivalent, running on Win 2000 through Vista. With its simple black screen, it's less chic than OMMwriter, but it does a great job at being about just you and your text.
Finally, there's RubyRoom with a few more additions. All three software programs come with word counters, but in RubyRoom the user can't switch it off, so if that feature's yet another distraction, then you're probably better off using one of the other options. You should also have basic Linux knowledge before diving into this one.
If you have any suggestions, please free to share your recommendations.
To your publishing success!
Note: I consciously decided not to mention any download links. The software mentioned above is available for free on the Internet. Before downloading .exe or .zip files always make sure your anti-virus software is up to date. Please scan the files before you install them. If in doubt, always back up any important files before installing anything downloaded from the Internet.