I try to keep it with me wherever I go since it contains my schedule, to-do lists, important files, disks and other materials that I might need at a moment's notice. I also ask others to remember things for me. For example, if a student needs a letter of recommendation, I ask her or him to send me an e-mail as the time gets closer, then I print the message and put it in my 'brain'. I have seen other people develop much more organized systems of this sort, in briefcases with flaps and folders and compartments that can be labeled. Cognition clearly is both embodied in brain, hands and eyes, and also distributed among various technologies and shared across groups.
Mind is more than brain.