TechCrunch has learned that Apple has made an acquisition aimed at boosting its e-books effort versus Amazon. It has bought Boise, Idaho, startup BookLamp. A source says Apple bought BookLamp’s employees and technology for a price that was “higher than $10 million, and lower than $15 million.” BookLamp’s most well-known product was the Book Genome Project, which makes suggestions based on natural language analysis of other titles.