Ok, here's an idea for a procrastination preventer. It's like the ones you've seen already, which you add to your browser, and then they kick you off reddit after 15 minutes or whatever, or blog problem domains entirely. Instead of that, a popup that asks "what are you supposed to be working on right now?" with a short text input. You type an answer, and carry on procrastinating. Then after 15 minutes, it pops up aga…
It also had a back off that was configurable. There were times when I was doing actually productive research that the constant questioning was annoying, especially intrawebsite. So you could delay the next request for N minutes based on a configuration.
Other sites were white listed. They were low volume, low distraction or high value like google.com.
In the end I destroyed because it felt like another failure. No one wanted it. So I took that as a personal rejection. It could just be that I did a poor job of marketing it. I might try making it again, but for Safari since I've recently changed.