My experience is that the Internet is a good source for "a recipe" while cook books are better sources for "a recipe that works" or "a recipe that is good." Food Network churned out two entire generations of celebrity chefs whose food is passable at best; most online bloggers will make a recipe once, photograph the shit out of it and then be extremely coquettish about whether it's any good. On the other hand, the recipes presented by restaurant owners and caterers and the like are generally presented as loss-leaders to drive up revenue at their physical business and if the recipes suck, that doesn't happen. If I'm trying something new I'll peruse five or six versions online. If I've decided it has promise I'll delve into the four linear feet of cookbooks at my disposal.