Just found this thread.

Becca, a Look pedal is built for the road which generally means exposed cleats for a shoe with no lugs on the bottom, maybe only a small pad on the heel and toe for walking. When you walk in these shoes, you are actually standing on the cleat itself.

Mtb shoes have lugs with an central spot for a smaller recessed cleat so that when you walk your weight is born on the lugs.

If you like Look pedals and Specialized shoes, ask your LBS about the road shoe version of whatever Specialized model you wear.