Not knowing more about your situation anything I recommend could be totally unusable or work like a charm.

How tied are you to Report Manager? How much control of the computer systems hitting the application do you have?

I am beginning just such a report. I will be using ASP.NET AJAX to collect parameter info and the Tab from the AJAX Toolkit to display different panels. I plan on putting an iFrame in each panel and launching the Report via a web call and display it in the frame. The CSS folk would probably like to string me up but since the application for our local plant and we only allow IE6 as the browser this will work just fine for what I need. It might work in your case also.

Regards,

Mike