If you haven’t yet, make sure to check out the new administration tool which allows you to view and change:
    1. Security settings
        • Authentication type
        • Configure role based authorization
    2. Application settings – yes, finally there is a tool to help you create and update web.config file
    3. Take an application offline 
    4. Configure SMTP
    5. Turn on debugging and tracing
    6. Define default error page
    7. Specify a data provider that stores user membership (SQL and Access databases supported out-of-the-box)

To view the site settings, navigate to
http://localhost/asp.netwebadminfiles/default.aspx?applicationPhysicalPath=C:\Inetpub\wwwroot\YourAppName\&applicationUrl=/YourAppName

You can also navigate to it from Visual Studio – open your web project, then, from the Website menu, select ASP.NET configuration.

The source for the admin tool’s pages is found in C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\ASP.NETWebAdminFiles folder.