Useful for just about anything you want to keep track of, remember, draw, etc., especially when you're out and about.  Small, thin, flexible, lightweight, fits into a pocket or purse,--and did I say totally cool too?  To-do lists, shopping lists, absolutely indispensible to me!  I buy these in all colors, and use them at home too.  I label the covers for reference, for instance: Guests/menus (so I don't forget and serve the same dishes to the same people!), Computer (tips, things I want to ask about), Garden (what and when I planted or harvested with notes), Auto (repairs, oil changes)--you get the idea.  One is labeled for each of my kids (notes of what they'd like or what gifts I gave them, etc. etc. etc.).  I like this better than computerized lists; these are just more available, always, a forever reference!  A great and thoughtful gift, people love them.