We are using Websphere Portal for use of the standard out-of-the-box Lotus portlets for Sametime, QuickPLace and Notes.
Given these portlets are hosted in WebSphere Portal, then there's a good chance they are written to the JSR-168 standard. If so, then perhaps they might be integrated with Plumtree's JSR-168 container, which is intended to allow 3rd-party portlets written to the standard to be surfaced as standard Plumtree portlets. Are these portlets so tightly integrated with WS Portal that they can't work outside of that container? Could they be able to be used in PlumTree as any other portlet rather than users using a separate environment to access the Lotus collaboration tools?