DarkCopy is an excellent distraction-free online text editor. It comes with a pretty black screen that is easy on your eyes and your laptop battery. No need to sign-up, simply log on to the page, switch to full-screen mode and you’re good to go. When you’re done, download and save text to your hard drive.
Another, quite similar service is recently covered Writer. Writer gives pretty much the same feature set but also allows you to save documents online.

Features
- Full-Screen Online Text Editor.
- No extra buttons. No font settings. Nothing.
- Option to switch between Full-screen and normal modes.
- Downlaod and save final text as .txt file.
Check out DarkCopy @ www.darkcopy.com [via LifeHacker]