One of the most interesting APIs in Android 2.2 allows developers to create applications that can receive messages from servers. “Android Cloud to Device Messaging (C2DM) is a service that helps developers send data from servers to their applications on Android devices. The service provides a simple, lightweight mechanism that servers can use to tell mobile applications to contact the server directly, to fetch updated application or user data.”
To try the new APIs, you can install an Android app and a Chrome extension that let you send a link from the browser to your phone and automatically open the URL in Android’s browser. Install the Android application, register your device and enable “launch browser/maps directly”. Then install the Chrome extension, click on the icon and log in to the same Google account used in Android. Now you can send links to your phone by clicking on a button in Google Chrome.
The application requires Android Froyo, which is only available for Nexus One at the moment.