Creating Vanity URLs.The vanity URLs are implemented with two files: the Global.asax and UserPage.aspx files.When appropriate, the Global.asax file rewrites the path of the request to the UserPage.aspx page.First, the Application_BeginRequest subroutine checks whether the request is for the Default.aspx page, the Userpage.aspx page, or a page below the /site/ subdirectory.
Scott on Writing
http://www.ahfyzs.com/content/05/0911/00/1519_11726.shtml
2005/9/11 0:52:44
To get Rss.aspx replaced with an HTTP 301 status code, the first step is to create an Rss.aspx file in your blog‘s root directory. The code needed for this page is alarmingly simple - all you want to do is return an HTTP 301 specifying the new feed URL, like so:<link rel="alternate" href="http://scottonwriting.net/sowblog/rss.aspx" type="application/rss+xml" title="RSS" >