I did a lot of work on the page editor yesterday. My focus has been to improve the UX to make it more enjoyable to write articles and post code. It relies heavily on jQuery in every aspect. I've also removed the form that slides down here on the Activity Stream. When you choose to create a page you'll be taken to the new page where you can edit and preview before posting. I've also removed the textarea borders to offer more of a sense of writing directly to the page rather than to a form.