I've got the article in one browser window and this post in another. Every time I see something I edit the post again. Although if Andrew wanted a collaborative editing process he could always put his drafts into a Wiki and then post the final versions as straight HTML ... (hint hint[1])
[1] No, I'm not just bucking for new content on the TWiki, nor am I trying to hijack Andrew's content to the community's site. But he could put up his own TWiki on his own server, and allow trusted users edit rights on the drafts.