O’Reilly.com has a good article that outlines Six Cool New JSP and Servlet Features. They are:

1. Using a servlet as a welcome file.
2. Mapping filters to RequestDispatchers.
3. The new ServletRequestListener and
   ServletRequestAttributeListener interfaces.
4. Using Expression Language (EL) code within template text, not just as tag
   attribute values.
5. Writing tag files.
6. Writing Expression Language qualified functions.

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