We are building a mobile app (starting with iPhone) called Pingmegram.
Pingmegram is a way to get notified of important messages that you care about from companies or people you are interested in (e.g., weather, traffic, specific product discounts). You decide which topics to subscribe to, and how you want to get notified for each (e.g. you may want to get notified via email on some topics or via SMS on others).
This app will be most useful to people who feel lost in a blizzard of information coming from a variety of sources, and that feel they get their information from too many sources. So the target audience would be people with very busy lives that have a lot on their mind, but do not want to miss the really important stuff.
So far we have launched our app to the App Store (www.pingmegram.com). The next few milestones we want to hit are (1) Offering further notification content to users, (2) Building up our userbase, (3) Expand to Android platform