Stupid Firefox wouldn't load an XML transform from a .ASPX page like IE will, so I had I couldn't stream the file dynamically. Instead, I had to write the script to save the stream to a .XML file.
This script needs to write to an .XML file on your server ( called blogger.xml in this example ). You'll need to assign write permission to that file.
<%@Page Language="VB" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Xml" %>
Third, I created an .xsl stylesheet for the feed and saved it to my server as a .xsl file. The stylesheet I created is for a Blogger Atom Feed: