SharePoint 2007 supports WSRP 1.1
Just realize that SharePoint 2007 has the ability to consume WSRP 1.1 portlets, meaning most Java based JSR-168 compliant portal server such as JBoss and Websphere (most of them have WSRP v1.0 or v1.1 support).
At the moment I am trying to setup a Java portal for demo so no details but you can check out this blog post to find out more.
Integrating SharePoint with other portals and web apps
http://blogs.technet.com/josebda/archive/2007/04/05/integrating-sharepoint-with-other-portals-and-web-applications.aspx
Time to discuss WSRP
http://blogs.msdn.com/mikefitz/archive/2006/02/06/525536.aspx
