I can't possibly be the only person who just writes in the cookbook itself? No?

Yeah, flags work better for me too, and I always write my notes in the book itself (well, if I remember to). Not only do I find that more helpful, but I know when I read through my grandma-in-law's old recipe collection and see her notes (and doodles!), I get a kick out of it, so maybe someday some descendant of mine will get something out of seeing my notes. :)

I really love this idea. When I'm developing and adjusting recipes at work, I can go through stickies like crazy! These can better organize my "jots" So I don't have to write out "use less of this," or "add more of that" which works for me.