Slate

IBM has hosted a self-explanatory Scenario based demo at http://wp50.dfw.ibm.com The demo portal site shows most of the key features of a Portal server. And its good to see them in action. Do check out for you-self. Also follow the demo viewlet guide. This way you will be able to follow this well-prepared scenarios and check out the features throughly.

Reference Links
Portal site
Demo Guides