The Web has created a common vocabulary for publishers to distribute content and applications to billions of browsers around the world. But people sometimes forget that the Web has also created a vocabulary for reaching beyond the browser -- to devices, gadgets, and services.
WeatherBug, who make some of the most popular weather tracking gadgets, are a prime example of this. Rather than seeing Silverlight as a competitor to the web, they realize that Silverlight gives them a way to extend their existing web services beyond the web browser.
Check out this interview and demo of the apps that WeatherBug built using Silverlight -- all re-using and leveraging existing Web Services.