Embedded applications, similar to iAd, on Iphone OS
<p>Apple <a href="http://www.engadget.com/2010/04/08/live-from-apples-iphone-os-4-event/" rel="nofollow">just announced the iAd platform as part of iPhone OS 4</a>.  It essentially is an embedded application with a unified interface where you close the embedded application using a small x in the corner.  This is obviously a nice experience for users, that could be used by other advertising platforms or to provide an embedded application such as dictionary service.</p>

<p>While details remains sketchy on the iPhone OS 4 public APIs, I am wondering if expert iPhone developers know whether this functionality can be replicated by third-party ad providers, or others interested in something like an embedded dictionary service.  Is this possible?</p>
