A few minutes ago I updated the component of the site that handles photo uploads. The changes are mostly improvements to reliability, but I have also increased the size of the photos once uploaded. So in some cases when you zoom in you will be able to see a larger version if you increase the size of your web browser window.
For those who are interested in the details, all photos that have width or height larger than 1024 pixels will be resized to 1024 pixels (this value was previously 640).
Things should also be just a tiny bit faster.
Please let me know if you see any strangeness.
UPDATE: There is now also a new viewer so that the larger images will scale down if you are using a smaller browser window.