15. One or more computer-readable storage media storing computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform acts comprising: examining a corpus of text associated with a particular item in an electronic catalog to determine if the corpus contains a phrase that is capitalized and that occurs more than a threshold number of times; and at least partly responsive to determining that the corpus contains a phrase that is capitalized and that occurs more than the threshold number of times, suggesting the phrase as a tag to be associated with the particular item.
15. One or more computer-readable storage media storing computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform acts comprising: examining a corpus of text associated with a particular item in an electronic catalog to determine if the corpus contains a phrase that is capitalized and that occurs more than a threshold number of times; and at least partly responsive to determining that the corpus contains a phrase that is capitalized and that occurs more than the threshold number of times, suggesting the phrase as a tag to be associated with the particular item. 16. One or more computer-readable storage media as recited in claim 15 , wherein the particular item is a book, and wherein the corpus comprises contents of the book.