Something that I've done is (and this is in Portal 4.2) is display the stored process in a dashboard. In this case the stored process displays a couple of complex charts. The user can drill through to a web report.
Here's how I did it.
Add a dashboard portlet to a portal page, create a new dashboard, create a new indicator, and select Display: Graph. Enter the URL to the stored process using the dashboard directive e.g. http://{Mid-tier-serverdomain]:8080/SASPortal/Director?_directive=STPRunParameters&_program=%2FDemo%2FStored+Processes%2FMy+Stored+Process
In the link tab for the indicator, select Web Report as the type and select the applicable report.
Hope this helps.