Renders a webpage to a png. Waits 500ms after the last network request to ensure ajax content loads (not 100% guaranteed, but 500ms is usually enough).

gistfile1.js

var webpage = require('webpage'),
    system = require('system'),
    fs = require('fs'),
    start,
    urls = fs.read('urls.txt').split("\n"),
    index = 0;

       
function fetch(url) {
        var timer,
        firstRequest = true;
        page = webpage.create();
        start = Date.now();
        console.log("Fetching: "+url);

    page.settings.loadImages = false;
    page.viewportSize = {width:1280, height: 900};
    page.onResourceRequested = function(request) {
            clearTimeout(timer);

            if(firstRequest) {
                console.log("Saw first request: "+request.url);
                timer = setTimeout(function() { render(page, url); }, 1000);
                firstRequest = false;
            } else {
                timer = setTimeout(function() { render(page, url); }, 500);
            }
    };
    page.open(url, function() {
    });
}

function render(page, url) {
    var time = Date.now() - start;
        var filename = url;

    filename = filename.replace(/[^-a-zA-Z0-9,&\s]+/ig, '');
    filename = filename.replace(/-/gi, "_");
    filename = filename.replace(/\s/gi, "-");
    console.log(time);
    page.onResourceRequested = null;
    page.render('images/'+filename+'-'+time+'.png');
    page.release();
    read();
}

function read() {
    var url = urls[index];
    index++;
    fetch(url);
}

read();