Qualitative analyses were used to launch a preliminary exploration of the dominant knowledge organization (KO) trends in the pre-and post-web eras. Data for this study was assembled by searching the Library, Information Science, and Technology Abstracts database for articles that have used the term 'knowledge organization' or 'information organization' in their titles, abstracts, or descriptors. Taken as a whole, these preliminary results suggest that the content of the KO literature has shifted since the advent of the web. Although classic KO principles remain prominent throughout both eras, the presence of new content areas, such as metadata, denotes a shift in KO trends. In the pre-web era, the literature was related in large part to indexing and abstracting. In contrast, cataloging and classification issues dominate the landscape in the postweb era. The findings from this paper will be of particular use to those interested in learning about upcoming trends in the KO literature.