Here are some typical usage scenario of IdentityPrincipal in ASP.NET.

Simple IsInRole calls (checks for a status claim with a value of ‘Gold’):

HttpContext.Current.User.IsInRole(“Gold”);

Retrieving the OrderHistory claim:

IdentityPrincipal ip = IdentityPrincipal.Current;
Claim orderHistory = ip.ClaimSets.FindClaim(
  Constants.OrderHistoryClaimType,
  Constants.ApplicationIssuerIdentityClaim);

var orders = orderHistory.Get<List<OrderDetail>>();

..or some authorization code from my CardSpace sample app – thanks to the unified authorization model, I can share this method across ASP.NET, ASMX and WCF:

public static IEnumerable<MessageBoard> GetBoardsForUser(
  AuthorizationContext context, bool includePublic)
{
    List<MessageBoard> boards = new List<MessageBoard>();

    foreach (Claim typeClaim in context.ClaimSets.FindClaims(
      AppClaims.UserTypeClaim,
      new ApplicationIssuerClaimSet()))
    {
        string type = typeClaim.Get<string>();
        if (“Public”.Equals(type) && includePublic == false) continue;

        boards.AddRange(GetBoards(type));
    }

    return boards;
}

I have updated the source download here to include a console, WCF and ASP.NET test app that share the same authorization model.