A handheld computer assembly for integrating an input device with a handheld computing device is disclosed. In one embodiment, the present invention is comprised of a handheld computer comprising: an integrated display screen; and an expansion slot. In addition, an input device for coupling to the handheld computer via connection with the expansion slot is communicatively coupled with the handheld computer. The input device comprises a first portion comprising keys and a second portion comprising cursor navigation implements and wherein the first portion and the second portion are disposed on opposite ends of the input device. The input device utilizes the expansion slot to provide the communicatively coupled connection with the handheld computer.