Epicurious is putting together a list of important cookbooks. The only categories I do fairly well in are International and Vegetables&Vegetarian. The article says the final ten will be announced on Friday, which I think was yesterday, but I haven't found that article yet. It looks like they will begin doing monthly cookbook reviews soon.
The long list ...
http://www.epicurious.com/expert-advice/the-epicurious-cookbook-canon-longlist-article
The search for ...
http://origin.www.epicurious.com/expert-advice/the-hunt-for-the-greatest-cookbooks-the-epicurious-epicanon-article