There are many new smart phone applications available now for gluten and dairy free living. Everything to ingredient checking, restaurant finders, recipes listings and even bowel movement trackers (includes an option to check whether you've consumed gluten that day). I've listed below some of the apps I am aware of. Please email and share if you know of any others. I have used most of these but have only found one to be truly useful. I've listed it first. The others, I've listed by category.
Gluten Free Registry (my favorite)
This app allows you to look up gluten free restaurants wherever you are located. I have found this app to the most comprehensive and offers the most accurate information. It will find the restaurant on your map app and list directions. The app also allows you to call the restaurant by simply pressing an icon, look at reviews, view the menu and you can even share info about the restaurant with your friends.
Other GF Restaurant Finders
Yelp - I love this app. You are already aware of it, I'm sure, but did you know you can do a gluten free search? Nice. Don't forget to sign up for my GF restaurant views while you're logged in.
iEatOut (On the Go) - This app allows you to indicate your food allergies/intolerances and then will generate a list of foods you can eat organized by ethnic category. I do not find this app useful.
GF Pizza - You can search by state but then it just generates a long list in which you need to scroll through and find your city. Pleasanton wasn't even listed. I don't recommend this app.
GF Disney - I have not been to Walt Disney World in Orlando, Florida but I understand that if you go this app is extremely helpful and that they now have lots of GF dining options there.

Dairy Free Fast Food/Gluten Free Fast Food - I'm not an advocate of fast food but these apps will list out the menu items in fast food restaurants that do not contain dairy or gluten. It does however warn you that you have to be aware of cross contamination issues.
Gluten Free Restaurant Items - This is a very simple app that lists restaurants including fast food chains and the menu items at each place that do not contain gluten.
Gluten Free Finder - This app will find gluten free resources in your area and generate a map. It works very fast but the list was not very thorough. It only listed PF Chang's, Outback Steakhouse and Chipotle for my area (Pleasanton).
GF Find Me Gluten Free - "Find Me Gluten Free" offers several options for searching - Around Me, Popular Chains and By Address. It offers a "dining card' that briefly explains gluten intolerance and lists ingredients that contain gluten. It can be used to show restaurant staff.
GF - This is a very basic GF restaurant finder. It does not offer many features.
Recipes
You can find many recipes on these various databases. I have yet to figure out how to use the features of these apps. I do not want to have my iPhone or iPad in the kitchen to avoid moisture issues. One of the apps did offer an email option so you can email the recipe to yourself. This I found useful. "Cook It Allergy Free" allows you to indicate which ingredients you need to avoid and then generates recipes based on that criteria. It also allows you to email yourself a shopping list.

Cook It Allergy Free, Gluten-Free Recipes, Allergy Free Entertaining Lite, GF Diet Recipes, Gluten Free 100 Easy Recipes, So Simple GF (listed in order of the icons above).
Ingredient Checkers
These apps allow you to look up ingredients to see if they're gluten free. These apps are nice for those who are just starting out on a gluten free diet.

Is that Gluten Free Gluten?
Other useful apps for special diets and lifestyle apps...
Bowel Movement Pro - If you are one of my clients, you know how I preach about the importance of daily bowel movements. It's imperative to gut health. This app allows you to track your daily bowel movements or that of your child. It also has an area to track water consumption. Water is crucial to regular bowel movements. There is another feature that allows you to indicate whether you've had gluten that day. Check it out!
Sparkpeople - Sparkpeople has been a long time favorite of mine. It allows you to track your food consumption and at the end of the day, will produce a pie chart that shows how many calories, grams of protein, carbohydrates and fat you have consumed
in a day. You can also track exercise, water consumption and weight loss. The Sparkpeople Web site and the app sync automatically.
Livestrong - Livestrong is similar to Sparkpeople. Livestrong also has a lot of good articles on food and health issues.
G-Free Foodie - The app provides locations of U.S. Gluten Free Restaurants near the user's location via GPS and Search Features, and offers hundreds of Gluten Free and GFCF Recipes, many with photos or video
. This is a new app for me and I have not used it much. Give me your feed back if you buy and like it.
Gluten Free Daily - This app offers a wide variety of options. A database of recipes, information on how to follow a gluten free diet, weight loss tips, fitness clips to view, a grocery list, daily tracking of your food intake and your diet success. You can sign up for a free month trial. I did not sign up because they require you to enter your credit card info for the free trial. Let me know if you try it out and what you think of it.
Gluten-Free - I downloaded this free app and have not been able to get it to work. Ironically, I can not longer find it in iTunes.
GF Shopping - The application is intended to be a one-stop shop for Gluten Free Shopping needs. It has a built in shopping list and allows you to scan a product's bar code to access information on that product. I have yet to get this app to work on my phone.
Magazine Apps
Currently, only two of the gluten free magazines have an app available.