gistfile1.js

$.when( getTweets('austintexasgov'),
        getTweets('greenling_com'),
        getTweets('themomandpops')
      ).done(function(atxArgs, greenlingArgs, momandpopsArgs){
    var allTweets = [].concat(atxArgs[0]).concat(greenlingArgs[0]).concat(momandpopsArgs[0]);
    var sortedTweets = sortTweets(allTweets);
    showTweets(sortedTweets);
      });

var getTweets = function(user){
    var url='http://twitter.com/status/user_timeline/' + user + '.json';
    return $.get(url, {count:5}, null, 'jsonp');
}

// see it in action at http://jsfiddle.net/94PGy/4/