Modularity in the UI - Web Widgets?

I'm delighted with the web centric approach to the next gen architecture.  (Although a bit skeptical about Silverlight).  In the "what's in it for me" vein I'd like to pose the following question:

Is it possible to develop the UI in such a fashion that modules, parts of the UI, could be used in our public websites?  The most obvious example would be the patron's address/contact information.

 

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