Another fiendishly addictive stationery supply from the 3M Corporation (which, BTW stands for Minnesota Mining and Manufacturing).

Like Post-It Notes, but designed for marking up documents, acting as removable 'bookmarks'. I especially enjoy the "sign here" Flags, which add a jaunty character to any 150 page legal document full of lawyering.

They dispense from their own cute little plastic shell, like really neat little Kleenex.