This one's easy - I use Microsoft Word most of the time because I tend to colour code my writing - red for ideas, green for outlines, blue for bits of text I've taken from somewhere else that have given me an idea, etc. I use Notepad as well sometimes when I just want to write without distractions, like when I'm word warring, have an idea I want to get out or am using a prompt to do some freewriting. I have tried Liquid Story Binder and I quite liked it, but not enough to pay for the full version.
I do most of my editing in Word as well, although I do print out everything before every big edit so I can mark up bits to change, highlight, scribble out and generally scrawl all over the draft before I make any changes on the computer.
What do you use to supplement your writing? Music? TV in the background? YouTube channels?
I like to write to music and give my story a soundtrack. I can't write with TV in the background because I get distracted, but I will put on CDs or, more usually, make a GrooveShark or YouTube playlist especially for the story. I use choosing a soundtrack as part of my character profiles too, deciding what sort of music they would like and what they'd be listening to in their everyday lives before I set dragons and/or aliens loose on them!
Bonus: Give us a screenshot of you mid-writing. Seriously. Pause, snap, post.
This is the planning stages of my Camp NaNo novel. I'm using a 100 words prompt for chapter titles and under each one I'm outlining what's going to happen in that chapter. I doubt I'm going to use all 100 prompts, but I find them useful to give me ideas when I'm not sure what to throw in next.