One of the coolest ones I have is Leone's Italian Cookbook, written by the son of the famous "Mother Leone", whose New York restaurant drew so many famous people. In addition to the great authentic recipes, it's a good read. Julia's cook books are great for the same reasons.
I have inherited a number of vintage cookbooks that I treasure greatly...my grandma White's Amish Brethren cookbook, with her handwritten notes and a handmade Mother's Day card from my dad when he was in the 4th grade tucked inside...a first edition of the Betty Crocker cook book from my aunt, who worked in the Betty Crocker test kitchens back in the 40's, and helped develope the recipes...my great-grandmother Foulk's Joy of Cooking, 1942 addition...and more.
Practically speaking, Joy of Cooking, Fannie Farmer, the New York Times cookbook, and the Cook's Illustrated cookbooks are my favorites. Cook's Illustrated does a lot of research, not only on recipes, but also on things like olive oil, pots and pans, and other cooking essentials, kind of like a cook's Consumer's research, listing their favorite product, best buy, etc.
And then there's my own cookbook...a compilation of my favorite recipes along with those of family and friends. I printed them up on Print Shop, complete with photos, onto both sides of card stock, put them in plastic sleeves and then into large loose leaf notebooks. The notebooks were plain white, with a clear plastic cover that one could remove. Instead of removing it, I printed up covers and inserted underneath it. Looks pretty, and every Christmas, I add more pages.