We at Team 100 are using one of the
line trackers to measure the speed of our shooter roller. We have the edge of our top roller painted half black and are using the sensor like an optical encoder. We've set up some LabView trickery to measure the time between the "pulses" of black and white and use that data to determine the rotational speed. There were a few programming kinks to be worked out, but the sensor worked as intended.
Early in the season, we tested a few other of these sensors (I believe it was only the limit switch and the ultrasonic sensor). We were able to successfully read their inputs on our cRIO test bed platform.