It's just about 1 year since I originally launched Protonotes. It was a decent service but required IE because I made it as an HTML application - a .hta. I chose to go that route rather than browser plugin or bookmarklet because I know that project teams would never be able to get everyone on their team to install or sign up for anything. With the .hta, you could just email out a link and as long as the user had IE installed, it would work.
It seemed so nice except for that one little IE thing. But I've come to see the light. Web designers and developers use Safari and Firefox. So the new Protonotes works on all the major browsers. But I still know that you can't get your project team members to install anything. So I chose to rewrite Protonotes so that you can install it on your prototype by just copying and pasting a few lines of JavaScript. Within a couple minutes you can activate Protonotes on your prototype so that anyone on your team can add "sticky" notes to it. If you're already using Protonotes as a .hta, you can still do so - it's backwards compatible.