http://afsweb.ms.com/ms/dist/msjava/PROJ/freemarker/2.3/docs/docs/pgui_misc_servlet.html
The link above gives information on how to change your web.xml to handle ftl files. However, it doesn't give any example servlets using that changed xml. The example servlet files in the distribution are associated with much less generic web.xml files, and are not helpful in showing how the servlet should be written so that it works correctly with the given web.xml file and the templates.
Thus, I think it would be very useful for someone to add example servlet code to this wiki (and later to the docs), that would work with the example template code linked to above.