I have just downloaded Scrivener. I am finding the tutorial a bit confusing but have just discovered the typewriter view mode. I think it worth the price of admission just for this!
I'm currently using office suite on my tablet. I have one file for notes, one for other information such as character biographys and a final one for the story. I have my tablet with me 90% of the time, and when I don't then I just use good old paper and ink.
I write all sketches and ideas down, write a bit of the actual story out, then type that up it and finish it on the computer. That's been my process lately.