Scientist have found out that blind people regularly use memory strategies to remember things, and hence more practice makes them perfect , giving them an edge over the normal people. They also are a whiz at remembering things in the right order. To identify otherwise indistinguishable objects, such as different brands of yogurt that vary only in their labeling, the blind typically place objects in arrangements of their own making and give mental tags for each of them. On conducting experiment on recalling words it was found that blind volunteers recalled 20 to 35 percent more words than sighted ones did, indicating a better memory overall.

Normally 20 to 30 percent of the brain is basically devoted to vision. With the congenitally blind, you have this brain area, the visual cortex, not getting its natural input so they use visual cortex for other needs like memory and language processes.
Source