This app is by far the best I have found for searching properties on line, bar none. Since it feeds straight from Realtor.com, it has the most accurate information and it's depth of features is striking. My favorite feature is the ability to draw a line around the area you are interested in on a map, and watch as the push pins drop out of the sky to mark each available house.
I confess that even though I am a realtor, I have never really used Realtor.com that much because it is geared to the public, but this app has really made me sit up and take notice. Now I use this app on a regular basis. Plus since I always have my iPad with me with clients, we can search to their hearts content right from my car.