Mobile App Ideas

So as you all know, this is becoming the era of mobile phones. Many people everyday are switching to smart phones and we as developers are trying to fulfill the needs of smart phones users. For anyone who sees this, if they see it, what mobile apps would you like to see on the market to satisfy your needs? I have an idea but I'm not sure that it will thrive too well in the market. I wanted to create a mobile tenant manager. My brother owns property and it gave me the idea to have an app that can manage all of your listings and information so when you have an open house you have all that information at the your fingertips. Would anyone be interested in that? Send me an email with your ideas.