Script Summary: For key giveaways on Alienware Arena. If you are logged into Alienware Arena, this script will automatically click the "Get Key" button for you, if it is available. Check comments section below for more information.

alienware_giveaway.js

// ==UserScript==
// @name        Alienware Giveaway
// @namespace   alienware_giveaway
// @include     http://na.alienwarearena.com/giveaways/*
// @version     3.7
// @grant       GM_addStyle
// @require  http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @require  https://gist.github.com/raw/2625891/waitForKeyElements.js
// ==/UserScript==
function GM_main ($) {
    
    //HAD TO INCLUDE waitForKeyElements.js INLINE, TO SUPPORT CHROME EASILY

 
    /*--- waitForKeyElements():  A utility function, for Greasemonkey scripts,
    that detects and handles AJAXed content.

    Usage example:

        waitForKeyElements (
            "div.comments"
            , commentCallbackFunction
        );

        //--- Page-specific function to do what we want when the node is found.
        function commentCallbackFunction (jNode) {
            jNode.text ("This comment changed by waitForKeyElements().");
        }

    IMPORTANT: This function requires your script to have loaded jQuery.
*/

function waitForKeyElements(
    selectorTxt,
    /* Required: The jQuery selector string that
                        specifies the desired element(s).
                    */
    actionFunction,
    /* Required: The code to run when elements are
                        found. It is passed a jNode to the matched
                        element.
                    */
    bWaitOnce,
    /* Optional: If false, will continue to scan for
                        new elements even after the first match is
                        found.
                    */
    iframeSelector
    /* Optional: If set, identifies the iframe to
                        search.
                    */
) {
    var targetNodes, btargetsFound;

    if (typeof iframeSelector == "undefined")
        targetNodes = $(selectorTxt);
    else
        targetNodes = $(iframeSelector).contents()
            .find(selectorTxt);

    if (targetNodes && targetNodes.length > 0) {
        btargetsFound = true;
        /*--- Found target node(s).  Go through each and act if they
            are new.
        */
        targetNodes.each(function() {
            var jThis = $(this);
            var alreadyFound = jThis.data('alreadyFound') || false;

            if (!alreadyFound) {
                //--- Call the payload function.
                var cancelFound = actionFunction(jThis);
                if (cancelFound)
                    btargetsFound = false;
                else
                    jThis.data('alreadyFound', true);
            }
        });
    } else {
        btargetsFound = false;
    }

    //--- Get the timer-control variable for this selector.
    var controlObj = waitForKeyElements.controlObj || {};
    var controlKey = selectorTxt.replace(/[^\w]/g, "_");
    var timeControl = controlObj[controlKey];

    //--- Now set or clear the timer as appropriate.
    if (btargetsFound && bWaitOnce && timeControl) {
        //--- The only condition where we need to clear the timer.
        clearInterval(timeControl);
        delete controlObj[controlKey]
    } else {
        //--- Set a timer, if needed.
        if (!timeControl) {
            timeControl = setInterval(function() {
                    waitForKeyElements(selectorTxt,
                        actionFunction,
                        bWaitOnce,
                        iframeSelector
                    );
                },
                300
            );
            controlObj[controlKey] = timeControl;
        }
    }
    waitForKeyElements.controlObj = controlObj;
}

   //END OF WAIT FOR KEY ELEMENTS
console.log('Loaded GreaseMonkey Script - ' + Date.now());
waitForKeyElements('#buttonGetKey', clickTargetButton);
function clickTargetButton(elem) {
    var theEvent = document.createEvent('MouseEvent');
    theEvent.initMouseEvent('click', true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
    var element = document.getElementById('buttonGetKey') .getElementsByTagName('a') [0];
    element.dispatchEvent(theEvent);
    while (element)
    {
        if (element.tagName == 'A' && element.href != '')
        {
            if (element.target == '_blank') {
                window.open(element.href, element.target);
            } 
            else {
                document.location = element.href;
            }
            element = null;
        } 
        else
        {
            element = element.parentElement;
        }
    }
}
waitForKeyElements('#giveaway-flash-message span.notice-title', flashTitle);
function flashTitle(elem) {
    console.log('flash');
    var oldTitle = document.title;
    var msg = 'You Recieved a Key!';
    var timeoutId;
    var blink = function () {
        document.title = document.title == msg ? ' ' : msg;
    };
    var clear = function () {
        clearInterval(timeoutId);
        document.title = oldTitle;
        window.onmousemove = null;
        timeoutId = null;
    };
    var title = $('div#giveaway-flash-message span.notice-title').text();
    if(title.indexOf("Success") > -1){
        console.log('success');
        timeoutId = setInterval(blink, 1000);
        //window.onmousemove = clear;
    }
}

}

if (typeof jQuery === "function") {
    console.log ("Running with local copy of jQuery!");
    GM_main (jQuery);
}
else {
    console.log ("fetching jQuery from some 3rd-party server.");
    add_jQuery (GM_main, "1.7.2");
}

function add_jQuery (callbackFn, jqVersion) {
    var jqVersion   = jqVersion || "1.7.2";
    var D           = document;
    var targ        = D.getElementsByTagName ('head')[0] || D.body || D.documentElement;
    var scriptNode  = D.createElement ('script');
    scriptNode.src  = 'http://ajax.googleapis.com/ajax/libs/jquery/'
                    + jqVersion
                    + '/jquery.min.js'
                    ;
    scriptNode.addEventListener ("load", function () {
        var scriptNode          = D.createElement ("script");
        scriptNode.textContent  =
            'var gm_jQuery  = jQuery.noConflict (true);\n'
            + '(' + callbackFn.toString () + ')(gm_jQuery);'
        ;
        targ.appendChild (scriptNode);
    }, false);
    targ.appendChild (scriptNode);
}

For key giveaways on Alienware Arena.
(http://na.alienwarearena.com/giveaways)

If you are logged into Alienware Arena, this script will automatically click the "Get Key" button for you, if it is available.

Hosted on UserScript.org For Easy Installation

http://userscripts.org/scripts/show/401990

UPDATED FOR CHROME INSTALLATION TOO! (v3.5+)

To Install Script in Chrome, click the green Install Button, and follow these instructions:
-Click the Options Bar in Chrome
-Tools -> Extensions
-Check the box "Developer Mode" in the top right
-Drag the downloaded script into the window

NOTE

If you know that you are early to a key giveaway, download an addon for automatically reloading/refreshing the page, and then this script will click the button as soon as it's available. I recommend ReloadEvery (https://addons.mozilla.org/en-US/firefox/addon/reloadevery/)

Can this script be used only to comment on giveaways? :D
It would be very useful.