MVC :: Alternative To ProfileCommon In .4.0?

I'd like to add some properties to logged in user. The last time I did this was a website made in VS2005 and ProfileCommon worked just fine. It seems however that this class is not included in web applications in general and .NET 4.0 in particular. I there for assume there is now a better way of doing this. Could anyone tell me what it is? In short I'd like to add PersonID to user's login to make it easy to hide information not related to that particular user by setting controllers like

if (!User.IsInRole("Administrator") {
var item = PickLists.GetPerson(User.Profile.PersonID); // or something like it
return View();
}
var item = PickList.GetPeople();
return View();
}