Tutorial Fade Image Into Another Image

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Make a div that is the exact size of the image. This div will have a background image applied to it of the second image. Then put an inline image inside it. 

<div id="kitten">
    <img src="http://cdn.css-tricks.com/images/kitten.jpg" alt="Kitten" />
</div>

Fading the inline image in and out will reveal/hide the second (background) image.

$("#kitten").hover(function(){

    $(this).find("img").fadeOut();

}, function() {

    $(this).find("img").fadeIn();

});

Tutorial Exclude $(this) from Selector

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Let's say you want to attach a click handler to every link on a page. The function for that click handler turns all the other links a different color.

var $allLinks = $("a");

$allLinks.click(function() {

     $allLinks.not(this).css("color", "red");

});

You can use the .not() function to remove elements from a set, so padding this to that function will remove the current element before the color change.

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).