I own about 70, a little hobby I have. I buy them used for $5-20 each at a couple book stores I visit when I pass by.
Found a website recently
http://www.eatyourbooks.com that lets you input your books and then search through the recipes on the site. They don't post the recipes, and don't include common pantry staples like salt, sugar, oil, etc in the recipes. It's useful to see what you need to make a recipe before getting the book out, but when you're ready to make it you're expected to go get the book.
I found this code: BLOGCOMP06 that gives you 6 months free with no book limits (normal trial has a limit of 5 books if I remember right).
It's a much better way of using your cookbooks if you're like me and have a bunch.