It uses the Gallery API and Gallery classes It ignores empty albums It caches the albums to improve speed It only viewes public albums Displays the photo caption in the block Dispays the album name and link
I have integrated this function now as a Geeklog block function - requried some code to restructured, use geeklog display method and fix a session related problem. Also added a little bit of logic to not display image caption names that are default ones - like your photo ID.
I've archived up the files and instructions and they are available on my site here or at squatty.com
Enjoy,
Blaine