I use the fast recipes from Cooking Light almost exclusively. At the end of the month I cut them out and save them. I also use a couple of the Cooking Light cookbooks (15 minute meals). I also get Food and Wine and use stuff from that. For the basics I use a Good Housekeeping cookbook I bought for my son when he was in high school, and a couple of Jewish cook books handed down from my mom.
I have a lot of other cookbooks, but most of them are full of recipes that are too fattening, especially the vegetarian ones.