We've done dialogue in IM, then copied into WP, then the one of us who has the pov character for the scene fleshed it out and finished the scene draft. Now, we're trying online writing. We can be working on the same file at the same time. Our experimentation hasn't gotten too far yet, but so far, so good. Worth trying if you write with someone else. If there's another free online word processor, I'd like to know about it.