Switch to the list mode in collection view, scroll to the bottom and load all the songs and run this code. You can import it to Spotify using Ivy (ivyishere.org).

rdio_collection_export.js

javascript:(function() {
	var bookmarklet = {
    		init: function() {
      			this.parse();
    		},
		parse: function() {
      			page = "";
      			$(".collection")
        		.children(".collection_items")
        		.find(".Track")
        		.each(function() {
        			line = [];
          			function buildLine() {
            				line.push($(this).text().replace(/^\s+|\s+$/g, ''));
        			}
 
        			$(this).find(".metadata").find("a:first").each(buildLine);
        			$(this).find(".name").each(buildLine);
          			page += line.join(" - ") + "\r\n";
      			});
      			
      			window.open("data:text/plain;charset=utf-8," + encodeURIComponent(page), "");
    		}
  	};
 
  	if (!window.jQuery) {
    		load();
  	} else {
		bookmarklet.init();
  	}
 
  	function load() {
    		var script = document.createElement("script");
    		script.src = "http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js";
    		script.async = true;
    		script.type = "text/javascript";
    		script.onload = function() { bookmarklet.init(); };
    		document.body.appendChild(script);
  	}
})();

Thank you! Saved me a bit of work