Differences between editions of items, such as books, can be determined and information about those difference provided for display to a user. The information can include a difference score, for example, that indicates an overall level of difference between the editions. This can include a percentage difference in some embodiments, considering the overall differences or differences for portions considered to be significant. In other embodiments contextual information, weightings, and other factors can be used to attempt to generate a similarity (or difference) score that will be of more use to a potential consumer, where the consumer can determine the substantive differences between the versions and determine whether the difference in price justifies the extent of the differences. The consumer in some embodiments can also view the differences, or at least a subset or information about the differences.