In the meantime, here's two more of these meme questions:
With fanfic, I generally use the computer for both outlining and writing. With original fic, I find that I really can only outline by hand, and I only use the computer for writing.
My favourite place to write is my friend's house, because it's both nice to just HAVE company, and easier to stay on task when you have someone that will raise their eyebrows at you goofing off.
I gave one of my plot bunnies to another writer once, and then acted as her beta for the finished story... so, that was a LITTLE bit of a collab. But, I've never really collaborated with anyone before. My friend and I outlined a possible Leverage fic that we would write together someday, but we both have so many other projects, I'm not sure it's actually going to get done.