ASP.NET httpHandlers - nice.
I have to admit, I do like the way you can add to your config some wildcard properties to your servlet - sorry handler - path.
add verb="*" path="*_app.aspx"
allows me to prefix any files which are linked to my application with an appropriate name. message_app.aspx will be resolved as an application within my intranet and be pointed to my intranet handler. Within my intranet handler I can then determine which command I need to use to execute the right actions for that application.
I like this a little better than the method I've been using for the Java Servlets, in that the prefix to the "action" header, such as action=message_view_item tells me that the keyword "message" is what will inform my Servlet about which command it is mean to execute.