18. The computer-readable storage medium of claim 17 wherein the software causes the processor to run the plurality of classifiers on said web page by applying each of a plurality of classifiers to the web page to generate a plurality of scores, one score for each classifier.
19. The computer-readable storage medium of claim 18 wherein the software causes the processor to select the advertisements by using the scores to select a top predetermined number of keywords, wherein each keyword is associated with a classifier.