Yes, Loot Ninja knows there are Previous and Next buttons at the bottom of most pages in the PlayStation Store. Now, you don't have to scroll through all the text to get to those buttons. You can use L1 to move back and R1 to move forward.
This was added during the recent downtime of the PlayStation Network. It was widely believed that the code for the PlayStation Store would need to be updated via firmware, however this update shows most of the code resides on the PlayStation Network servers.