Just wondering what your must-have cookbooks are... I've gathered a few and I would really love to have more! I just got Bake by Rachel Allen and I love it! Excellent information on sweet and savoury things, techniques, and general recipes for pastry and cookies, plus a few casserole recipes that look nice. Made two recipes out of there so far and both were good.
Also, I love Jamie Oliver's Ministry of Food cookbook, great for basic things like Yorkshire puddings and other English classics.
The Joy of Cooking is an excellent reference, too, and there are lists of conversions and substitutes in the back, which come in handy.
I'm considering getting Delia's giant How to Cook because I have used several of her recipes I found online with great results.