I also have a ring binder with plastic sleeves. I use it for recipes I cut out of magazines and newspapers, recipes found on line, and to hold the recipe cards I pick up at the grocery stores. It is a pretty amazing collection, I need to go back and organise it.
I have some Barefoot Contessa books and they are great.
But as a kid, we only had one cookbook at our house, the Better Homes and Garden one with the red and white gingham cover. When I first left home, I thought you would never need another cookbook! I have become a lot more adventurous since then and now have about 2 dozen cookbook, but I still use the H&G one a lot, especially when I feel homesick for childhood goodies.
A recent acquisition that I really like is Bake by Rachel Allen. I think she is rather like the Barefoot Contessa in her style. Easy to make recipes, great on flavour.