There are an increasing number of CD-ROMs being peddled in the medical textbook market, either as de novo products of variable quality, or, as in this example, an electronic version of an established textbook. The disk’s contents include not one, but four books. These are verbatim reproductions of the second (1995) edition of Yamada’s textbook of gastroenterology, together with the bonus of the accompanying self assessment question book, the atlas of gastroenterology and its self assessment guide. This certainly represents value for money, saving at least £80 if one was to buy the printed set. There is also a considerable saving in weight (100 g compared with several kilograms), although it does not look quite so impressive sitting on the bookshelf and could easily …