QuiEdit, a full-screen text editor, is the most recent addition to the cogsci software family. I initially developed it for personal use, to write blog posts and such. Like most people, I'm easily distracted when I'm behind a computer (checking email, visiting news sites, etc.). I find that a full-screen text editor really helps when you want to get some writing done. Plus it's kind of pretty, I think, and if you disagree you can easily create your own theme.
Get it here!