Google just announced a new feature in Google Maps: Click to Call. When you find a business on Google Maps, you can ask to be connected directly. Google then calls you on the number you provide, and places a call to the business at the other end.
This is yet another example of seamless task migration. The user's ultimate goal in locating a business is to get in touch with them. The most common way to do this today is to call using a phone (at least as long as Voice-over-IP is not as ubiquitous as cellphones and land-lines). Lo, Google bridged the gap. End-to-end support for a user's tasks using multiple devices is a challenge that's getting its due attention only recently.
Hopefully, we will soon be able to do the same with phone numbers all over the Web. Imagine a button on my website that says, "click to call me". Or, a button on my photo albums page that says, "view as a slideshow on the living room TV". Or being able to press a button on your car radio to "read more about the currently-advertised product once I'm back home".