1. A method for defining relationships between tags, wherein a tag is a user-specified term that describes a data item, comprising: receiving an initial tag for the data item; presenting the initial tag in a user interface, where the user interface includes an option to suggest additional relationships for the initial tag; receiving user input through the user interface that relates the initial tag with a second tag, wherein defining a relationship between the initial tag and the second tag facilitates defining a set of related tags for an organization; and tracking data associated with the relationship, wherein tracking data associated with the relationship involves one or more of the following: tracking a set of users who have suggested relationships between the initial tag and the second tag; tracking a set of relationship strengths defined between the initial tag and the second tag; and averaging the set of relationship strengths between the initial tag and the second tag to determine an average value for the relationship between the initial tag and the second tag.