You can certainly minimize the impact of this by writing your application using the canonical forms of your links, for example in your links you can always link to the right content for example: <a href="http://www.carlosag.net/tools/webchart/">http://www.carlosag.net/tools/webchart/</a> and remove the default.aspx, however that only accounts for part of the equation since you cannot assume everyone referencing your Web Site will follow this carefull