You can now easily navigate the zoomed in photo pop-up with keyboard shortcuts, in addition to the clickable arrows.

• Use the right and left arrows to navigate forward and back one photo at a time.
• Use the up and down arrows to go to the first and last photos.
• Hold shift while pressing the left or right arrows (or use the page up or page down keys) to jump by 10 photos at a time.

Try it out next time you are browsing the photos.  What’s great is that it even works with my Windows Media Center remote control!