O k, taking a look at how WordPress does their DB, take a look at this graffle, if you want to look along. I'm not sure about some of the foreign keys, which are marked with dashed lines. As John points out, it's a slightly old db structure, but it'll do. I'm just scanning for general ideas.

Actually, this brings up two side issues: 1) I don't like that the image URL shows up in the /templates directory. I maybe should have a /images directory or a way to auto-wrap references to images in /_templates/images so that the URL is cleaned up. 2) I'm obviously on the sliding slope of browser demands. PNG images seem like something that all browsers should be able to do by now. I'm already asking that the browser be able to handle a certain level of CSS/XHTML, so that seems minor.