Thank you Ivan (Yogi),

This solution does order the links correctly (first by type and then by title), but I would like to have the types seperated from each other so that I can place headers between them.

Secondly, I would like the classified_ads to be ordered not by title (alphabetically) but by add-date (chronologically). The websites and articles should remain alphabetically ordered.

Once all this is in place I will buy the "Attachment" plug-in from you and the "Expire" plug-in from Andy! Anything for sale Paul?