Sakai support for JSR 168 is in the Sakai SVN trunk. For notes on checking it out, compiling, and using it, see http://communitygrids.blogspot.com/2007/03/sakai-jsr-168-tests.html. This will be officially part of the Sakai 2.4 release.
Sakai uses Pluto 1.1 for portlet support. OGCE grid portlet support in Sakai is currently being tested.
See http://www.flickr.com/photos/dr-chuck/420092745/ for a Google Map portlet photo (built with JSF and using the Apache JSF portlet bridge).