Prophund Secure Reporter can provide infinite levels of drill down.
Link reports to data. Allow your users to follow the data. Provide fancy panels for extra information.
Link Reports
Use primary keys to join up reports
Define a column to enable the values to be used to provide the parameters to another report
Create the report to goto
Run the query
Click on row value to drill down to the other report
Panels for greater information
Go from a table to a panel of rich data. Automatic formatting of data allows pleasant panels.
Create the report to show data rows
Create a panel that details everything about that row