One quick options is to simply use
web clipping. It's an administrative task, but most portals, including JetSpeed2 and WebSphere Portal, have mechanisms for doing web clipping.
Alternatively, you could cut and paste your
Servlet code into a portlet.

Actually, it's not too far from the truth, as the portal API (JSR168) is very similar to the Servlet and JSP API.
The probably path? Web clip the stuff you want to get access to quickly, and then in parallel, convert your servlets to portlets.
-Cameron McKenzie