Their older books were the first technical books I would buy on O'Reilly's reputation as a publisher and I was seldom if ever wrong. But things have changed, O'Reilly has grown and there target market is now the mass market from what I can see. So the few customers they loose on the drop in quality they more then make up for with volume. Now I feel that most of their new books are not writen by smart people or for smart people.