I have a hard time telling when I am watching a page. The envelope image clicking back and forth between watch and not-watch should be more apparent. Maybe it is because I am color blind, but I think it should be more clear. Either do a completely different image, or make the colors contrast way more. Also, when clicking back and forth trying to figure out if I was watching or not - I didn't know what image indicated watch and which one didn't. Maybe the envelope, when clicked on, could change to say: 'Watching.'

Just ideas.