I have created one more blog which will contain all my portlets related study, my OOA/D study and my astrology study. What more is you can also get RSS feed. The link is Portlets Development. You will find most of the information there too.
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.