Just a quick way to make a default role for everyone that signs up for your web site if you are using ASP.NET Memberships, with ASP.NET MVC.
First, add this to the top of your AccountController...
using DotNetRoles = System.Web.Security.Roles;
Then, you want to add this around line 105 of the same file. Please note that in this example, I already have a role "Users" that I want everyone to default to.
DotNetRoles.AddUserToRole(userName, "Users");
Here is an image of the modified method.
After that, you are good to go. Enjoy.