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Update: Another new photo feature that we won't be reviewing separately: Flickr launched Flickr Collections yesterday, a highly requested feature on the site. A collection is a container into which you can place sets or other collections, creating a hierarchy.
A tiny, but very useful feature addition announced by Facebook today: drag and drop sorting for your photos within albums. To arrange your photos, you now just hit the "organize" link within any album - when you're done, hit save. There's the option to reverse the order, too.
Facebook claim to have had in excess of a "bajillion" requests for the new feature, suggesting that Facebook's growth rate is even greater than we thought. ;)