I've just finished an improvement for my Card Creator. Now if you click on a text area to edit it, rather than a popup that you have to type HTML into, you will be able to edit the text in place. You still have to use HTML tags for things like bold and italic text, but you don't need to use the "br" tag for newlines anymore, which makes it much easier to lay out elements on the larger text areas. It doesn't always look terribly pretty during editing, but it does make it a lot easier to use.
Now if only I could figure out a way to export the cards without having to resort to using screenshots.