i think that it is hard to get portlet examples. we worked on weblogic portal by using weblogic workshop for only few days because the project was delayed.
for developing portlets in weblogic workshop(uses eclipse
IDE internally) we had gone through the following url
http://e-docs.bea.com/wlp/docs92/ in a portal we will have n number of portlets if we want to exchage data between to portlets we go for Page Flows in weblogic/events(sun provided jsr 168 specification(it is a
java class) which is generic to all portal servers)
just try to create a portal with two portlets in one portlet specify userName, passWord and save button when save button is clicked capture the data in the second portlet and display. to capture write a java class (jsr 168)