A method of assessing the value of tags in a collaborative tagging system can include monitoring user interaction with each of a plurality of tags and/or artifacts associated with tags, wherein each of the plurality of tags has been previously associated with at least one artifact of the collaborative tagging system. For each of the plurality of tags, a measure of value for the tag can be determined according to user interaction with the tag. A list comprising at least one tag and an indication of the measure of value of the tag can be output.