While many people prefer full screen text editors because it clears the space of nothing but words, there are also other considerations in choosing your writing application of choice. Personally, I prefer Mellel [http://www.redlers.com/mellel.html]. For some of Mellel users' discussion relating to full screen text editing, take a look at their fora here : [http://forum.redlers.com/viewtopic.php?t=60] Many users are in favor of a full screen mode, so perhaps it will make an appearance in the upcoming 2.0 release.
Just remember that full screen editing is not the only reason to choose your writing tool. Other items that I've found indispensable for writing in Mellel are its OpenType support, auto-numbers and excellent style system.
-- Robert Cameron