App_Data databases and aspnet_regsql

Quite often when working with ASP.NET projects in Visual Studio 2005 it is very tempting just to add the database to the project as a new item. But how on earth do you add the useful ASP.NET database design to a database that cannot be found on your server instance? After a very short Google search I found the answer here Using ASPNET_RegSQL.exe with SQL Express databases in APP_DATA, thank you Lance!