With CloudMade changing their API to focus on enterprise customers, I had to find an alternative for hosted map tiles.

There’s a good gist from mourner that shows Leaflet.js TileLayer shortcuts at https://gist.github.com/mourner/1804938

Instead of the old CloudMade tile tutorial used on Leaflet:

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L.tileLayer(‘http://{s}.tile.cloudmade.com/API-key/997/256/{z}/{x}/{y}.png’, {
attribution: ‘proper attribution goes here’
}).addTo(map);

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You can use Open MapQuest:

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L.tileLayer(‘http://{s}.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.png’, {
attribution: ‘proper attribution goes here’,
subdomains: [‘otile1’, ‘otile2’, ‘otile3’, ‘otile4’]
}).addTo(map);

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Just make sure your attribution properly reflects all your sources.