Entity Framework and layer separation

Question

I'm trying to work a bit with Entity Framework and I got a question regarding the separation of layers.

I usually use the UI -> BLL -> DAL approach and I'm wondering how to use EF here.

My DAL would usually be something like

GetPerson(id)
{
    // some sql
    return new Person(...)
}

BLL:

GetPerson(id)
{
    Return personDL.GetPerson(id)
}

UI:

Person p = personBL.GetPerson(id)

My question now is: since EF creates my model and DAL, is it a good idea to wrap EF inside my own DAL or is it just a waste of time?

If I don't need to wrap EF would I still place my Model.esmx inside its own class library or would it be fine to just place it inside my BLL and work some there?

I can't really see the reason to wrap EF inside my own DAL but I want to know what other people are doing.

So instead of having the above, I would leave out the DAL and just do:

BLL:

GetPerson(id)
{
    using (TestEntities context = new TestEntities())
    {
            var result = from p in context.Persons.Where(p => p.Id = id)            
                    select p;
    }
}

What to do?