Liu Jun and Hardy Groeger published a great article when I was on vacation. If you are interested in Widgets and Comp Apps this is a great primer.
This article introduces the concept and usage of Notes? My Widgets. Through several examples, it shows you how to create Notes widgets from different kinds of resources in IBM? Lotus? Notes? 8.0.1. Finally, it depicts the process that you can use to build a sample composite application leveraging Notes widgets.