New visual rule builder (Michael Neale) I have been beaving away on a new UI/rule modeller specifically for the web (well, at least the web initially, hopefully we will also do it stand alone in the plug in soon).
R. Agrawal, and R. Srikant. Proceedings of the 20th international conference on Very Large Data Bases (VLDB'94), page 478--499. Morgan Kaufmann, (September 1994)