Weird. I was trying to add it from my home computer and when I got to work this morning, it was there and had populated it with the feed.
Dark [feed] Magic
LOL - I was thinking it was because the link was asp not xml but I guess it didn't matter after all.
ASP just means that it is a site using MS ASP technology to generate the page, just like PHP, ASPX and others. ASP is a reference to an application platform. What ASP generates as output is text, like HTML or XML.
ASP, though, was last used around 2002. That's VBScript, most likely.