Just read a review by Geertjan of a NetBeans module for a JasperReports visual report designer created by Toni Epple. The UML team will be keeping an eye on the progress of this module and will be thinking in terms of exposing our UML data model elements as fields that can be dragged onto this report designer. No work has begun on this, but we are well aware of the value add of UML custom reports.
Here is Geertjan's review