WriteRoom and Dark Room are distraction-free word processors for Mac and PC, respectively. The advantage is that these programs are full-screen, meaning that you can’t see your other programs. No more email messages popping up and interrupting your flow. No quick switching between IM and your scholarly article.
You can change the color scheme, but the default looks like working in the Matrix! They’re also both free applications.
What other programs or technological do you use to stay productive?