In my experience, people interested in portals can be roughly divided into two groups. One of those groups cares deeply about WSRP and JSR168 and the other doesn’t. If you belong to the former group or are simply curious about what WSRP and JSR 168 are and what Microsoft‘s position regarding both is, please read the informative blog posts courtesy of Mike Fitzmaurice, a Technical Program Manager on the SharePoint team:

WSRP – http://blogs.msdn.com/mikefitz/archive/2006/02/06/525536.aspx
JSR168 -  http://blogs.msdn.com/mikefitz/archive/2006/02/10/529682.aspx


-Vlad