Demonstrating the use of MapQuest tiles in OL.

examples/mapquest.js

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+var map = new OpenLayers.Map({
+    div: "map",
+    projection: "EPSG:900913",
+    layers: [
+        new OpenLayers.Layer.XYZ(
+            "OpenStreetMap", 
+            [
+                "http://otile1.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
+                "http://otile2.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
+                "http://otile3.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png",
+                "http://otile4.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png"
+            ],
+            {
+                attribution: "Tiles Courtesy of <a href='http://open.mapquest.co.uk/' target='_blank'>MapQuest</a> <img src='http://developer.mapquest.com/content/osm/mq_logo.png' border='0'>",
+                transitionEffect: "resize"
+            }
+        ),
+        new OpenLayers.Layer.XYZ(
+            "Imagery",
+            [
+                "http://oatile1.mqcdn.com/naip/${z}/${x}/${y}.png",
+                "http://oatile2.mqcdn.com/naip/${z}/${x}/${y}.png",
+                "http://oatile3.mqcdn.com/naip/${z}/${x}/${y}.png",
+                "http://oatile4.mqcdn.com/naip/${z}/${x}/${y}.png"
+            ],
+            {
+                attribution: "Tiles Courtesy of <a href='http://open.mapquest.co.uk/' target='_blank'>MapQuest</a> <img src='http://developer.mapquest.com/content/osm/mq_logo.png' border='0'>",
+                transitionEffect: "resize"
+            }
+        )
+    ],
+    center: [0, 0],
+    zoom: 1
+});
+
+map.addControl(new OpenLayers.Control.LayerSwitcher());