6. A computer-implemented method of generating a display that presents text associated with multiple product reviews of a single product, comprising: receiving from a user an indication of features of the single product for which the user desires sentiment analysis; utilizing a computer processor that is a component of the computer to cluster sub-document linguistic units of relevant documents into clusters, wherein each of the clusters corresponds to one of the features for which the user desires sentiment analysis; assigning a sentiment and a confidence measure to each sub-document linguistic unit, wherein for each sub-document linguistic unit the confidence measure is a measurement of a confidence with which the sentiment was assigned; generating the display so as to include an indication of the sub-document linguistic units, a cluster to which each sub-document linguistic unit was assigned by the computer processor, a sentiment attributed to each sub-document linguistic unit, an overall sentiment attributed to each of the clusters, and the features of the single product for which the user desires a sentiment analysis; and wherein generating the display further comprises generating the display so as to include a user input mechanism that receives a user-initiated selection of a minimum confidence level that the confidence measure attributed to each sub-document linguistic unit must exceed for a sub-document linguistic unit to be included by the computer processor within any of the clusters, and wherein generating the display further comprises generating the display so as to include a plurality of boxes, wherein at least one of the plurality of boxes changes sizes in response to receipt by the user input mechanism of the minimum confidence level.
7. The method of claim 6 wherein generating the display further comprises generating the display so as to include a plurality of tabs that are each associated with a particular sentiment, wherein actuating a particular one of the plurality of tabs causes sub-document linguistic units corresponding to the sentiment associated with the particular tab to be displayed in one of the plurality of boxes.