Portale

SUN Portal

http://blogs.sun.com/portal
http://blogs.sun.com/portal/entry/ajax_samples_in_sun_java
http://forum.java.sun.com/category.jspa?categoryID=111
Building Portlets with Ajax Behavior

Portlets

http://www.portletexchange.com
http://labs.jboss.com/portal/portletswap
http://www.portletbridge.org
http://portlets.blogspot.com/
http://www.ja-sig.org/wiki/display/PLT/
http://tech.groups.yahoo.com/group/portlets/files/Free%20Portlets/
http://www.uportal.org/cvs.html
http://www.jsr168.org/
http://sourceforge.jp/projects/pal/, Website: http://pal.sourceforge.jp/en/index.html

$ Portlets

http://www.syncex.com/