First, it starts by suggesting the OK-Cancel order doesn't matter (bikeshed issue), but then goes on to nearly double the size of the article with a convincing case that you should stick with the platform's defaults.
Second, it doesn't even mention that 'Cancel' buttons are often superfluous on the web, because 'Back' is available and usually preferable. UseIt even has an article on that subject he could have linked to:
http://www.bikeshed.com/