It can be pen and pencil, a desktop computer, or a laptop.
Even if you’re writing non-fiction, you need a bit of an imagination to come up with different ways of wording your thoughts
The laptop, for me, is now a requirement. Thank god I have one now. 🙂 I do a lot of thinking when I’m “sitting on the pot”, so taking a laptop with me means I don’t have to go “well crap, what was I thinking about?” when I finish. I can also set it to record while I’m in the shower and keep track of them then. Or I can not be a cheapskate, get a program like Dragon NaturallySpeaking and let my mind wander while I’m showering, or doing the dishes, or whatever. I’d have to be careful with that, though, or else I might end up picking up my son’s jabbering as well.
So, what programs/necessities do you have for NaNo?