I have a tiny netbook that, with perhaps a healthy dose of irony, cannot connect to my wireless at home. It's great for writing. And because I use it only for writing (...and maybe some Spider Solitaire), as soon as I power it on I get into that mindset; I'm not looking for distractions.

Music helps me, too, but it almost always has to be instrumental. If there are words, I will be singing. I can't help myself!