1- VPD (Virtual private database), for example how to define security and access level over rows or fields (e.g. spatial) of a database table . Even how can one define access levels over different tools in a mapviewer based application.
2-EDITOR: The new out of box java applet web editor is very perfect. However I think the source is closed and the users can't modify its look and feel. It would be nice if it was possible to translate it into another language for example via Locale. One more thing about the editor is that when we want to edit a geometry by selecting it, not all vertices of the geometry are shown. There is this bounding rectangle that is drawn around a shape which is not suitable for editing in many cases.
So posting some articles about the new Web Based Editor will be a charm. :)
3-OBIEE: Integration of BIEE and Mapviewer.