Notebooks are great, but unless you're writing in pencil, they're one-use affairs. Whiteboards are great for sharing ideas with others — but who wants to carry around a whiteboard everywhere? Nuboard combines the two into a slick sketching and sharing tool. This A4-sized notebook features multiple pages of whiteboard-like material, separated by translucent sheets that let you expand on your thoughts with overlays. It's like a full presentation, only in notebook form.