In answer to blade's first github issue: can blade be used with mapbox and markercluster? Sure, the mrhyde library underenath should work with almost any js library. Here's my port of the example code.
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<!--- THIS FILE LIFTED FROM THE WEB:
https://www.mapbox.com/mapbox.js/example/v1.0.0/leaflet-markercluster/ -->
<html>
<head>
<meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' />
<link href='https://api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.css' rel='stylesheet' />
<!--[if lte IE 8]>
<link href='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.ie.css' rel='stylesheet' >
<![endif]-->
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<!--
Include Leaflet.markercluster's CSS and JavaScript assets.
Unlike mapbox.js, these are not hosted by MapBox; you will
need to download and host them yourself.
Note that the 0.2 release of Leaflet.markercluster is not
compatible with the version of Leaflet used by mapbox.js.
This example uses assets from the master branch (@ 6fda9a206)
of https://github.com/Leaflet/Leaflet.markercluster.
-->
<link rel="stylesheet" href="https://www.mapbox.com/mapbox.js/assets/MarkerCluster.css" />
<link rel="stylesheet" href="https://www.mapbox.com/mapbox.js/assets/MarkerCluster.Default.css" />
<script type="text/javascript" src="_ArrayLikeIsArray.js"></script>
<script src='https://api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.js'></script>
<!--[if lte IE 8]>
<link rel="stylesheet" href="/mapbox.js/assets/MarkerCluster.Default.ie.css" />
<![endif]-->
<script src="https://www.mapbox.com/mapbox.js/assets/leaflet.markercluster.js"></script>
<!-- Example data. -->
<script src="https://www.mapbox.com/mapbox.js/assets/realworld.388.js"></script>
<div id='map'></div>
<!-- This is blade-mapbox.cljs compiled into javascript. -->
<script type="text/javascript" src="blade-mapbox.js"></script>
</body>
</html>
Modified http://api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.js to a secure url
Modified http://www.mapbox.com/mapbox.js/assets/leaflet.markercluster.js to a secure url
Modified http://www.mapbox.com/mapbox.js/assets/realworld.388.js to a secure url
https://api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.js
https://www.mapbox.com/mapbox.js/assets/leaflet.markercluster.js
https://www.mapbox.com/mapbox.js/assets/realworld.388.js