I am excited about the newest feature on g(Math), plotting points from cells in your Sheet. Select a range of cells in your Sheet and clicking the button Get Points From Selection. It will populate the points with the first column being the x values and the 2nd column as the y values.

Once the points are in the points box, set your axes values and you can Preview the plot. You can insert those points as a plot in a cell by clicking Insert into current cell button.