UrlMappings Element
I was excited to see the <urlMappings> element. When enabled, you can specify url's that when entered into the browser will redirect to another page. For example, take the following section:
<urlMappings enabled="true">
<add url="~/link.aspx" mappedUrl="~/newlink.aspx" />
<add url="~/weather.aspx" mappedUrl="~/info.aspx?section=weather" />
</urlMappings>
While not the best examples, they illustrate the point. When you go to link.aspx, newlink.aspx will display; however, link.aspx will show in the browser. You can also use this to hide querystring values, so that when you go to weather.aspx page, the right querystring value is provided.
More information is available at: http://msdn2.microsoft.com/en-us/library/ms228302.aspx