>I have a one-to-many form with a grid on it. The user has now thought of 2 more pieces of related data that she would like to track in this grid. Is there an easy way of inserting a new column in a grid and have all existing columns and their PEM's shift over 1?

You can add a column either in Form Designer (Grid.ColumnCount=2) or in run-time (Grid.AddObject("ColumnX","Column)). You will have to adjust ColumnOrder properties to get right column order.