iPhone - retrieve images in background (PUSH)
<p>I would like to build an app which retrieves images from my server.
My problem is that I want it to work in the <strong>background</strong> and only when there is a 'new image' to load.</p>

<p>It seems like what I need is very similar to PUSH notifications: </p>

<ul>
<li>Work in the background</li>
<li>Only when there is 'something new' to load.</li>
</ul>

<p>I guess what I want became possible with the new iOS4.
Please tell me if this is feasible.
Any links for how to even start thinking about it would be great. 
Thanks.</p>
