It appears that Facebook is adding some options on tagged photos.
As pointed out to Inside Facebook by Lithuanian reader Aidis Dalikas of Socialus Marketingas, when a user sees a photo where a person is tagged, they can mouse over to reveal a menu, accessing more photos of that person, as well as friends of that person.
Readers: Have you seen this?
Source: Inside Facebook
New photo feature: Options appearing on tagged photos