Yet another update: Understand that I'm not telling you to give up your computer. I'm just saying that there are options when it comes to composing text. The different methods use different parts of your brain, so switching between them can be a good way to get past writers block.
I mentioned earlier this week that after reading Neal Stephenson's article on the benefits of writing by hand, I've been working that way all week. In fact, today I bought a lap desk so I can write anywhere in the apartment. Naturally, I added a mouse for my cat, Aces.