It is a good powerpoint presentation on JSR 168 portlet. Portlet newbies and students will find it useful.
JSR 168 portlet
About IBM WebSphere Portal, Liferay Portal and other Java Portals, JSR 168 portlet, JSR 286 portlet, portlet development, and WSRP etc. Will also try to write about mobile application development like iPhone development, Android development, Nokia development etc.