Do you need a search book but you don't want to bother with so much math?

I definitevely recomend the new Algorithms of the Intelligent Web. Very concise explanation of all the modern search, data mining, machine learning techniques. Some of the contents in the book:

• evaluatation: precision, recall, F1, and ROC curves;
• ranking: PageRank; DocRank; ClickThrough ranking.
• classification: Naive Bayes, neural networks; decision trees, Bagging; Boosting, etc
• collaborative filtering; recommendations;
• clustering: k-means, ROCK, DBSCAN