Facebook’s always changing something with their interface, and the photo viewer is no exception! The latest iteration allows you to not only download individual pictures, among other things, but it also allows you to control all your album sharing options from one place, too!
When in the Facebook photo viewer, simply click on a picture, and in the lower right-hand portion of the screen click the little drop-down arrow next to Share album with:
From here, you can choose to make the photo album Public, for friends only or choose individual friends by clicking the Custom selection.
See? Not all the changes Facebook goes through have to be negative, do they?