I'd really like to be able to store a URL against each shape and block of text, such that when the diagram is exported as a PNG (or other format that can be read in a browser) an HTML image map is also generated for each of the links from different parts of the image. That way I'd be able to keep the image map up to date when teh diagram is modified (eg boxes moved around). I see this as achieved by adding these shape properties:

• HTTP link
• Hint text (to be used as the title property of a link)

Export would then need to output both an image and the accompanying HTML code