What do you write on?

I have been wondering while writing my current story, what do people here use to write? I usually write on dreamweaver, i like the way it formats the htm, but the lack of an auto save can be a pain when it crashes (nearly lost an entire chapter from that). I have looked at word, but it seems to really mess up html, or at least over complicate it. I also seem to have a problem with conflicting spell checkers when it comes to us vs English spelling (color / colour etc.)

Lisa