1. A system for use in selecting at least one cardiac pacing site, the system comprising: a first elongate lead configured to be positioned along a right ventricular heart wall, wherein the first elongate lead comprises a first electromagnetic sensor in which a first signal is induced when positioned in a magnetic field, wherein the first signal is usable to track wall motion when the first elongate lead is directed to a first position along the right ventricular heart wall; a second elongate lead configured to be positioned along a left ventricular heart wall, wherein the second elongate lead comprises a second electromagnetic sensor in which a second signal is induced when positioned in a magnetic field, wherein the second signal is usable to track wall motion when the second elongate lead is directed to a second position along the left ventricular heart wall; a controller configured to receive non-paced heart wall motion data based on signals induced in each of the first and second electromagnetic sensors when the first and second electromagnetic sensors are secured at the corresponding first and second positions, wherein the controller is further configured to receive paced heart wall motion data based on signals induced in each of the first and second electromagnetic sensors when the first and second electromagnetic sensors are secured at the corresponding first and second positions and cardiac pacing stimulation is applied at one or more first pacing sites, and further wherein the controller is configured to execute a program to generate image data representative of a comparison of non-paced heart wall motion and paced heart wall motion based on at least a portion of the non-paced heart wall motion data and at least a portion of the paced heart wall motion data, wherein the image data representative of the comparison is indicative of the effectiveness of pacing at the one or more first pacing sites; and a display to visualize the image data representative of the comparison to assist a user in selecting at least one pacing site.