With the Google AJAX Feed API (GAFA), you can download any public Atom or RSS feed using only JavaScript, so you can easily mashup syndication with your content and other APIs like the Google Maps API.
JavaScript and XMLHttpRequest use the Same-Origin Policy (SOP). With this policy, scripts can access data from the same host that the containing page of HTML was served from, but not from any other hosts. SOP protects users from certain scripting attacks, but unfortunately, also hinders a lot of developers from writing AJAX-based mashups. The Google AJAX Feed API offers a workaround to these restrictions for syndication feeds across the internet. [more]
