The Logitech KeyCase is a 10.5- by 5-inch swatch of thick fabric that wraps around your Palm m100 or m500 with an attached elastic band to form a tough, water-resistant case. Unfold it and you get a flat, pressure-sensitive QWERTY keyboard. The KeyCase is fabulous in concept but only fair in implementation. It offers plenty of shortcuts but falls down in speed and typing accuracy. But having to tote only one lump in your pocket or briefcase rather than two is attractive.