I'm sort of working on my bigbang fic. It's finished, so I'm mostly going through it and beta-hunting. It's my "Sam's transsexual and Dean's an awesome brother" fic. An idea that wouldn't leave me alone until I complied and opened a new document for it, so (points to next paragraph)...

When I speed!write, I just open an empty document and start writing until my head's empty, more or less. I have a knack for shutting everything going on around me off, which kind of helps. But mainly I just start writing, and then I don't stop for however long it takes.