This app, (which is available for Palm Pre/Pixi, iPhone, and soon for Android), has saved me time and time again. I have used it at the liquor store to hunt down just the right Sangria recipe... I've used it to find and weed through red-velvet cake recipes, to find a good Oat Bran muffin, and to run through the ingredients in Jambalaya, to make sure that I have all of the spices I need at home before I get there.
Along with searching through an extensive library of recipes, you can save them to your recipe list, make shopping lists and even enter in and save your own original recipes.
I hope that you find this application useful!! If there are any apps that you use to help answer the age-old question "What's For Dinner?", please share them!!