PageCat Update
Well, I was working on PageCat again last night and after a few stupid mistakes I got some things working pretty neatly.
I can now add graphics via URLs to articles using the HTML editor. You just click on the Add Image button and a dialog pops up. This dialog will eventually allow you to specify an existing file from the web server or upload a new file for inclusion in the article. Before I complete this, though, I will need to add a database configuration plugin, so I can add/edit/delete the database config table.