The OffBeatGuides model was simple: create personalised travel guides using content from around the web for a destination and time period unique to the user.
Using the same principle of overriding the default implementation of the Tag handler, there are many different customizations that can be added to portal Server for a highly personalized portal site.
They provide a consolidated interface for applications that are customizable through preferences, tailored with unique layouts, and personalized through selectable content.