The next button turns on a feature that will tell you via e-mail if anyone leaves a comment on this picture. This will flag pictures that are not yours, but you are interested in other member's comments.
It is a push-on/push-off kind of feature; i.e, if you return to a picture you have turned it on for...clicking it again will turn the feature off.
Receive email updates
This next button is also very neat. Clicking this will show the image in a Printable form
Printable View
That is, it will spawn a new window with just the picture, and no surrounding items, so you can print a clean copy if desired.