Over at the Book Arts list on Yahoo, there's currently a discussion about the slot-and-tab book structure. Carol blogged about the structure here when people asked her about the book in her blog header, and Celia posted her sample with instructions here.
I followed the instructions in Alisa Golden's book, Creating Handmade Books. I've made many of the book structures in the book, but I had never tried this one before. I used scrapbook stock decorated with woodless colored pencils and water-soluble crayons -- 8 sheets in 4 colors, with half decorated and half plain. Even with all these colors and patterns to help me keep it straight, I may not have attached the 2-sheet signatures to one another in a consistent manner. I'll look at it again later when I have more time. I only had an hour for this today.
Some of the heavier tab papers were harder to curl through the slot papers without damaging. I imagine a strong, long-fiber paper like kozu paper would work well with this structure. It's a great non-adhesive binding structure.