9. A system for selecting advertisements in a computer environment, comprising: a database of electronic advertisements; and an electronic advertisement management system, comprising: a converter capable of converting an observed behavior of a user computing device in the computer environment to a behavior vector, a profile adapter capable of modifying a profile vector indicative of the user with the behavior vector, a comparater capable of comparing the modified profile vector to a plurality of entity vectors, the entity vectors indicative of the electronic advertisements, so as to identify at least one entity vector closely associated with the observed behavior, and a selector accessing the electronic database with the identified entity vector so as to select at least one electronic advertisement to communicate to the user computing device.
9. A system for selecting advertisements in a computer environment, comprising: a database of electronic advertisements; and an electronic advertisement management system, comprising: a converter capable of converting an observed behavior of a user computing device in the computer environment to a behavior vector, a profile adapter capable of modifying a profile vector indicative of the user with the behavior vector, a comparater capable of comparing the modified profile vector to a plurality of entity vectors, the entity vectors indicative of the electronic advertisements, so as to identify at least one entity vector closely associated with the observed behavior, and a selector accessing the electronic database with the identified entity vector so as to select at least one electronic advertisement to communicate to the user computing device. 10. The system as defined in claim 9, wherein the selector includes inventory management to allow selection of an entity that is under-selected according to the selection schedule and to inhibit the selection of an entity that is over-selected according to the selection schedule.