Mac users have been excited about WriteRoom, a no-frills text editor that whose background color is an eyeball-friendly black and the font is a cool green Courier, which looks very familiar to command line lovers. No distractions and a slim column complete this optimized environment for the serious writer.
Windows users have an alternative in Dark Room. It looks promising, but is still rough around the edges at this point.
Perhaps the best alternative of all is to build your own WriteRoom clone on Windows using Microsoft Word.