5. The system of claim 1 , wherein said user selection of one of the tags previously created by the user comprises a user selection of a link comprising text corresponding to the tag previously created by the user.
1. A system for enabling a user to obtain focused item recommendations for a user-specified category of items, the system comprising: one or more computer systems comprising computer hardware, the one or more computer systems programmed to implement: a tagging system that provides functionality for a user to: create tags via entry of text strings into tag fields of item detail pages, the item detail pages each comprising information descriptive of a catalog item in an interactive catalog of items, and associate the tags with selected catalog items of the interactive catalog such that each of the tags classifies one or more of the catalog items, wherein the tagging system is configured to store user-specific tag data in a data repository, the user-specific tag data reflecting an association created by the user between the tags and the selected catalog items, wherein the tagging system outputs for display to the user one or more of the tags created by the user; and a recommendation system configured to generate tag-specific recommendations by at least: receiving a user selection of a displayed tag of the one or more tags output for display to the user; programmatically accessing the user-specific tag data in response to receiving the user selection of the displayed tag, to thereby identify at least one of the selected catalog items previously tagged with the displayed tag by the user, without requiring further user interaction, programmatically accessing item relationship data to identify a set of additional items that are related to the at least one of the selected catalog items previously tagged by the user, and selecting the tag-specific recommendations from the set of additional items for output to the user.