Entity Framework and SaveChanges

Hi,

I am new to the entity framework and have a question, which maybe silly.

public static BlogSeries BLogSeries_Save( BlogSeries source )
        {
            using ( var ctx = new BlogEngineEntities() )
            {
                ctx.BlogSeriesSet.AddObject( source );
                ctx.SaveChanges();
            }
            // What do i do to return the saved source object???
        }

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I am trying to create an n-tier application and therefore i am doing some crud operations and what not. I need to return the changed entity after this save operation as this is important as a few things have identity columns and timestamps and what not that are populated by the SQL Server when the item is updated.

My Question therefore is:
After the SaveChanges is run, what do i need to do to return the source object that has now been saved.