33. The method of claim 1 , further comprising weighting the learned periodicities of user selections according to at least one of a measure of recency of selection of the content item having the analyzed descriptive terms, number of selections of the content item having the analyzed descriptive terms, and time of use of the content item having the analyzed descriptive terms, wherein the act of selecting and ordering the collection of content items is further based on the weighted learned periodicities so that content items associated with descriptive terms further associated with learned periodicities having relatively higher weights are ranked relatively more highly.
33. The method of claim 1 , further comprising weighting the learned periodicities of user selections according to at least one of a measure of recency of selection of the content item having the analyzed descriptive terms, number of selections of the content item having the analyzed descriptive terms, and time of use of the content item having the analyzed descriptive terms, wherein the act of selecting and ordering the collection of content items is further based on the weighted learned periodicities so that content items associated with descriptive terms further associated with learned periodicities having relatively higher weights are ranked relatively more highly. 34. The method of claim 33 , wherein the weights of the learned periodicities are decayed as time passes from the act of learning the periodicities.