6. A system for categorizing items of interest, the system comprising: a data store adapted to maintain one or more descriptions for one or more item categories, wherein each item of a plurality of items offered for sale using a network-based service is associated with at least one of the one or more item categories; and a computing device having one or more processors, wherein the computing device is adapted to operate a categorization service and is in communication with the data store, and wherein the categorization service is operative to: generate item information associated with a first item of the plurality of items; compare the item information to a first description in the one or more descriptions maintained in the data store; and determine at least one category recommendation to be a first item category based on a similarity of the item information and the first description, wherein the first description is a textual description of the first item category; and assign the first item category to the first item, wherein the item information is represented as an item vector according to a vector space model and a category vector according to the vector space model comprises a representation of at least a portion of the first description, and wherein the at least one category recommendation is automatically determined to be the first item category if a deviation of an angle between the item vector and the category vector is less than a threshold value.
11. The system of claim 6 , wherein the categorization service is further operative to update the item information to include the first item category.