In this 19 minutes video, John Mulhausen demonstrates how to create an Azure-hosted, push notification-sending web service and an accompanying phone app.
Source: Silverlight SDK
1) Do you want to see how to send/receive every kind of Push Notification that there is for Windows Phone?
2) Do you want to know the certification rules and usage restrictions involved with using Push Notifications for Windows Phone?
3) Do you want to see how to make a web service and consume it in a Windows Phone app?
4) Have you been meaning to try Azure but thought it would take MORE than 90 seconds to learn how to publish on it?