title: iPhone MKMapView Annotation Clustering
body: <p>I've got quite a lot of pins to put on my map so I think it would be a nice idea to cluster those annotations. I'm not really sure how to achieve this on iPhone, I was able to work something out with google maps and some javascript examples. But iPhone uses its mkmapview and I have no idea how to cluster annotations in there.</p>
  
  <p>Any ideas or frameworks that you know and are good? Thanks.</p>