In terms of information I'd have to say Larousse Gastronomique. It isn't primarily a cookbook, more of an encyclopedia but it does contain lots of recipes and technical information. Similarly Jane Grigson's Vegetable book is very authoritative.
Cranks Bible is excellent for vegetarian food that doesn't scream about it: food from all over the world that happens to be vegetarian, rather than omnivorous food with the meat taken out. There is an important distinction.
I might go and check out that Moosewood book.
I love reading Nigel Slater and Heston. I don't use many of their recipes though I did faithfully make Heston's ketchup injected chips... Had a slightly unusual conversation with a medical supplier about what gauge hypodermic needles would be best for injecting something as viscous as ketchup.