A couple years ago I was hired to build a checklist web app based on Atul Gawande's book, The Checklist Manifesto. Being the very idea that you're referring to here it's a very relevant example.
The guy who hired me has invested a lot of time and some money into trying to get traction but nothing has come of it. Granted he's probably not done everything perfectly, but he's put a lot of time into seeding the site with public checklists for different subjects and trying to get people using it.
As far as I know nobody uses the site. It's not that great but it provides some basic value and is definitely a minimum viable product including revisions, public and private checklists, ability to share and collaborate with others, pdfs, etc.
For those curious the site is here: http://expertchecklists.com/
I think that one of the challenges in the business proposition you make is the translation from paper to screen, somewhere between Gawande and Tufte.
Find one of the productivity books, preferably ones that are quite popular. Implement a software, web-app, mobile-app, desktop-app, plugins, whatever, based on such books.You'll get instant userbase that love your software.
Rinse-and-repeat.
There are a few productivity tools based on GTD out there. Looking at the checklist-for-checklists link that adolph mentioned in this thread reminds me of Trello. Seems like a simple money making scheme don't you think?