Try going through JSR-168 spec, JSR-168 API doc and IBM WebSphere Portal InfoCenter where you can find documentation about how to develop standard(JSR-168) portlets. IBM Redbooks are also an excellent source. Also, you can search in IBM DeveloperWorks.
Work Hard, Expect The Worst...<br /> <br />Bimal R. Patel<br />(SCJP 1.2, SCWCD 1.4)
Actually I have already started developing the portlet, and also tried to deploy it on Websphere Portal Server v5.1.
But I am unable to see my portlet. I get the message 'The portlet is unavailable'. I tried to search for the error, but couldnt find a possible solution.
On my planet I'm considered quite beautiful. Thanks to the poetry in this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop