iPad Usability: Year One

Obviously, tablets might become truly personal devices in the future as competition drives down the prices. But for now, you should assume that youre designing for a multi-user device. For example, users might be reluctant to stay permanently signed in on an app, and theyll still forget their passwords. Its also important to design recognizable application icons so theyll stand out in the crowded listings of several users apps.

via iPad Usability: Year One Jakob Nielsens Alertbox.