Cassini had a problem with ASP.NET projects using Routing due to the directory listing feature.  Cassini would respond with the directory listing to any request for a directory, without handing over the request to ASP.NET.  As a result, requests for friendly URLs would get intercepted by Cassini and never reach ASP.NET.

This update (v3.5.0.1) changes the logic around – all requests go to ASP.NET first, then Cassini intercepts 404 responses and, if the request was for a directory, it responds with the directory listing.  Applications relying on friendly URLs / Routing now work better with Cassini.

(6/25/2009) v3.5.0.2 fixes the default document problem