I\'m thinking about trying out MVC later today for a new app we\'re starting up, but I\'m curious if it\'s an all or nothing thing or if I can still party like it\'s 2006 wi
You'll need to make sure your MVC routes don't conflict with your Web Forms pages so that requests for a .aspx page don't get routed to a controller action as a parameter etc.
See this blog post by Phil Haack for details on how to avoid this.