Here's an exclusive TUAW video preview of Urban Airship's latest product, AirMail. Like their other products, AirMail is powered by a precompiled drop-in library that developers add to their iPhone applications. AirMail adds a whole new spin on push notifications by transforming them from lightweight messaging into a more durable and interactive product.
Normally push notifications give a simple heads-up to users along the lines of "You have mail" or "Someone tweeted your name." AirMail goes further. It uses the iPhone's push notification infrastructure to enhance two-way communications between service providers and their customers.
As this video shows, push notifications are no longer throwaway products. Using AirMail, they can be stored and referenced through an in-app library. Applications can create message histories that persist well beyond the life of a normal push message. What's more, those notifications can involve the user in a multi-directional process, whether confirming that they have taken their pills (as shown here), are ready to take a meeting, or that they acknowledge that a security alarm was triggered in error, among other uses.