Best way to update cross domain dom via Javascript
<p>I want to allow a 3rd party domain to access data on my domain/site by giving them a JavaScript to include with a unique key to allow access and return an array of data to update a dom element on there site. IE: RSS widget, twitter like widget etc. </p>

<p>From what I can gather JSONP is the way to achieve this, however I am wondering the best way to set this up.</p>

<p>Any help will be greatly appreciated. </p>

<p>Thanks!</p>
