How about including an option to convert between posts & pages. There is a P2P plugin which does this and I use it on the sites that I control. But, I have several sites on WordPress.com, and have suggested that they offer this feature, but they do not currently see the need to do this.
Here is why I think I need this functionality: I sometimes use the post via email and post via phone, and often the publish from MS Word 2007. None of these mechanisms allow me to select whether I create a posting or a page (they all go up as postings). Once they are in my WordPress.com site as postings, I do not have an easy option to change them to a page.