Tutorial Equalize Heights of Divs

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var maxHeight = 0;

$("div").each(function(){
   if ($(this).height() > maxHeight) { maxHeight = $(this).height(); }
});

$("div").height(maxHeight);

Tutorial Draggable without jQuery UI

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It doesn't have all the fancy callbacks and options, but hey, it makes things draggable (and with a specified handle optionally). 

(function($) {
    $.fn.drags = function(opt) {

        opt = $.extend({handle:"",cursor:"move"}, opt);

        if(opt.handle === "") {
            var $el = this;
        } else {
            var $el = this.find(opt.handle);
        }

        return $el.css('cursor', opt.cursor).on("mousedown", function(e) {
            if(opt.handle === "") {
                var $drag = $(this).addClass('draggable');
            } else {
                var $drag = $(this).addClass('active-handle').parent().addClass('draggable');
            }
            var z_idx = $drag.css('z-index'),
                drg_h = $drag.outerHeight(),
                drg_w = $drag.outerWidth(),
                pos_y = $drag.offset().top + drg_h - e.pageY,
                pos_x = $drag.offset().left + drg_w - e.pageX;
            $drag.css('z-index', 1000).parents().on("mousemove", function(e) {
                $('.draggable').offset({
                    top:e.pageY + pos_y - drg_h,
                    left:e.pageX + pos_x - drg_w
                }).on("mouseup", function() {
                    $(this).removeClass('draggable').css('z-index', z_idx);
                });
            });
            e.preventDefault(); // disable selection
        }).on("mouseup", function() {
            if(opt.handle === "") {
                $(this).removeClass('draggable');
            } else {
                $(this).removeClass('active-handle').parent().removeClass('draggable');
            }
        });

    }
})(jQuery);

Usage

$('div').drags();

Demo

Reference URL

Tutorial Display Only First X Divs, Toggle Rest

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var news = 2;
hidenews = "- Hide news archive";
shownews = "+ Show news archive";

$(".archive").html( shownews );
$(".news:not(:lt("+news+"))").hide();

$(".archive").click(function (e) {
   e.preventDefault();
       if ($(".news:eq("+news+")").is(":hidden")) {
           $(".news:hidden").show();
           $(".archive").html( hidenews );
       } else {
           $(".news:not(:lt("+news+"))").hide();
           $(".archive").html( shownews );
       }
});

HTML:

<div class="news">First news</div>
<div class="news">Second news</div>
<div class="news">Third news</div>
<a class="archive" href="#"></a>

Reference URL

Tutorial Display Latest FeedBurner Post

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This snippet will display the latest post in a specified FeedBurner feed. Just set the URL to your desired FeedBurner feed. 

$(document).ready(function(){
       $.ajax({
               type: "GET",
               url: "http://feeds.feedburner.com/examplefeed",
               success: function(data){
                       $("#date").text($(data).find("item:first>pubDate:first").text());
                       $("#title").html("<a href='"+$(data).find("item:first>link:first").text()+"'>"+$(data).find("item:first>title:first").text()+"</a>");
                       $("#description").html($(data).find("item:first>description:first").text());
               }
       });
});

This example assumes that there are 3 elements that this information will be sent to, with the ID attributes set to date, title and description respectively.

Tutorial Display Last Tweet

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The code below no longer works as-is with the Twitter API update to 1.1 as of 2013-06-11. The 1.1 API requires oAuth which requires a server side component. Here's a PHP way to interact with the new API. Googling around will find you many other libraries and such. There is an all-JavaScript method for getting tweets, but it may be a bit of a loophole that you may not want to count on. 
$.getJSON("https://api.twitter.com/1/statuses/user_timeline/chriscoyier.json?count=1&include_rts=1&callback=?", function(data) {
     $("#twitter").html(data[0].text);
});

Make sure you change username.json to your actual username and #twitter to the actual selector you wish to replace the contents of.

You can play around with this on this CodePen (deprecated).

Tutorial Display Browser and Version

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This is jQuery specific, and contains a bit of a hack/fix for dealing with Chrome. This works between jQuery 1.5.1 and jQuery 1.8.3. It's gone in jQuery 1.9. Presumably because it was used too improperly too frequently and it was hurting the web. Better to feature detect when possible.

var userAgent = navigator.userAgent.toLowerCase(),
    browser   = '',
    version   = 0;

$.browser.chrome = /chrome/.test(navigator.userAgent.toLowerCase());

// Is this a version of IE?
if ($.browser.msie) {
  userAgent = $.browser.version;
  userAgent = userAgent.substring(0,userAgent.indexOf('.'));	
  version = userAgent;
  browser = "Internet Explorer";
}

// Is this a version of Chrome?
if ($.browser.chrome) {
  userAgent = userAgent.substring(userAgent.indexOf('chrome/') + 7);
  userAgent = userAgent.substring(0,userAgent.indexOf('.'));	
  version = userAgent;
  // If it is chrome then jQuery thinks it's safari so we have to tell it it isn't
  $.browser.safari = false;
  browser = "Chrome";
}

// Is this a version of Safari?
if ($.browser.safari) {
  userAgent = userAgent.substring(userAgent.indexOf('safari/') + 7);	
  userAgent = userAgent.substring(0,userAgent.indexOf('.'));
  version = userAgent;	
  browser = "Safari";
}

// Is this a version of Mozilla?
if ($.browser.mozilla) {
	//Is it Firefox?
	if (navigator.userAgent.toLowerCase().indexOf('firefox') != -1) {
		userAgent = userAgent.substring(userAgent.indexOf('firefox/') + 8);
		userAgent = userAgent.substring(0,userAgent.indexOf('.'));
		version = userAgent;
		browser = "Firefox"
	}
	// If not then it must be another Mozilla
	else {
	  browser = "Mozilla (not Firefox)"
	}
}

// Is this a version of Opera?
if ($.browser.opera) {
	userAgent = userAgent.substring(userAgent.indexOf('version/') + 8);
	userAgent = userAgent.substring(0,userAgent.indexOf('.'));
	version = userAgent;
	browser = "Opera";
}

// Now you have two variables, browser and version
// which have the right info

Tutorial Disable / Re-enable Inputs

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Disable:

$("#submit-button").attr("disabled", true);

Re-enable:

$("#submit-button").removeAttr("disabled");