I would love to see you reinvent the post-it. I LOVE (L-O-V-E) post-its but they are SO wasteful! So I don't use them :(. I'd love it if they were made from the same material as your notebooks but had some super human reusable adhesive (like 1000+ uses) or some nano suction (I have an iPad holder that uses that...no adhesive needed). Anyway, if you make it, I'll buy it, no questions asked!
All the best!