I’ve mentioned WriteRoom before, and I’ll probably mention it again. I love the idea behind this software: if your entire screen is taken up by your writing, you are less likely to get distracted.
Personally, I’ve found that WriteRoom is my best option for pounding out fiction, especially short fiction. It isn’t as good for non-fiction, though, or really anything requiring research.* But I’m very prone to distraction, especially on nifty little websites I may have find.
WriteRoom takes a very simple approach to the whole scenario. When the program is open, you can’t see toolbars, other programs, etc. You see only a black screen with green letter, reminiscent of the old IBM word processing programs. You can shift to the equally old school options of amber letters on a black background or white letters on a blue background.
WriteRoom is Mac only, and is a free download. The makers do ask for fans to pay for a license to help them keep making great software. I haven’t seen too many comparable options for Windows.
*I’ve found a sorta useful work around with two monitors. WriteRoom only operates on one screen, so I can keep my research window open on the other monitor. However, Word still seems more effective for articles, etc.