With Java jsps, there is a very powerful and useful action tag for content reuse called include - <%include file="filename" %> which includes the file at runtime. This action allow for the passing of parameters. (Do not confuse action tag with the directive - <%@ include file="display.jsp" %> - which runs at time of translation. This would apply at a master or page template level.)
For example a welcome message that is used on many sites and not in a DB. Place it in an html file, have the aspx page "include" it, attach the aspx page to a webpart on the pages where the message is to appear.
Is there an aspx equivalent that can be use on an aspx page that would would bring in various html fragments? Something simple like the shtml ?