It's not so very many years since one of the regular chores for the computer user was the ritual cleansing of the mouse ball, something as alien to most modern users as punched cards, valves or Netscape. This routine usually involved undoing a catch on the underside of the mouse, extracting the ball, dropping it, swearing, accidentally kicking it under the table, swearing again, grovelling around on your hands and knees, grabbing the ball, rising in triumph, hitting your head on the underside of the table, swearing more violently, clambering back on to your chair, cleaning seemingly impossible quantities of fluff off the ball itself and a couple of little plastic rollers  Read the complete review