A new feature in ASP.NET 2.0 is it's built-in url rewriting support. When i looked into this new feature i found out it lacked regular expressions support, wich is really the point of an Url Mapper. ScottGlu at his blog, explains the reason why the ASP.NET team didn't implemented this feature. Basically they realized that a full featured version would want to take advantage of the next IIS 7.0 new features, specially the support for all content-types (images and directories). Anyway, it's really simple to implement a Url Rewriting Module with Regex support in ASP.NET. I wrote a quick and simple HttpModule for this.