</div>
</div>
<div class="right" id="sidebar">
<div id="sidebar_content">

<!-- CODE REMOVED FOR BREVITY. -->

<!-- Latest Tweets by BOUTROS ABICHEDID.-->
<?php
/************************************CODE-1******************************
* @Author: Boutros AbiChedid 
* @Date:   May 30, 2012
* @Websites: bacsoftwareconsulting.com/ ; blueoliveonline.com/
* @Description: Display your Latest tweets (from your Twitter account) on 
* your WordPress Blog.
* @Tested on: WordPress version 3.3.2 
* @DO NOT REMOVE this header section (see terms of use.)
*************************************************************************/
?>
<div class="box">
<div class="box_title">Latest Tweets</div>
<div class="box_content">
	<?php
    //Path to include feed.php file located in wp-includes folder.
    include_once(ABSPATH . WPINC . '/feed.php'); 
    
    //Retrieves the feed and parses it. Specify the feed URL. This is my feed, put yours.
    $rss = fetch_feed('http://twitter.com/statuses/user_timeline/abichedid.rss');
	
	$tweetnumber = 4;  /* How many tweets you want to show. Must be >= 1 */
	$maxitems = $rss->get_item_quantity($tweetnumber);
	
	$firstitem = 0; /* Specify the first item. 0 to start from the newest tweet. */
    $rss_items = $rss->get_items($firstitem, $maxitems); 
    ?>
    
    <div class="twitter-list">
        <ul>
        <?php 
		if ($maxitems == 0) 
				echo '<li>No Tweets Yet!</li>';
        else
        //Loop through each feed item and display it as a link.
        foreach ( $rss_items as $item ) { ?>
        	<li>
            <!-- Get the tweet item title as an external link.-->
        	<a href='<?php echo $item->get_permalink(); ?>' target="_blank" title="External Link&#8230;" rel="nofollow">
            <?php echo $item->get_title(); ?></a> <br />
            <!-- Get the tweet item date.--> 
            <span><?php echo 'Posted: ' . $item->get_date(); ?></span>
        	</li>
        <?php } ?>
        </ul> 
    </div>
</div>
</div>
<!-- END OF Latest Tweets by BOUTROS ABICHEDID. -->  

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar() ) : ?>

<?php the_subpages(); ?>
<?php if ( $recent_posts = get_posts('numberposts=10') ) : ?>

<div class="box">
	<div class="box_title">Recent posts</div>
	<div class="box_content">
		<ul>
	<?php foreach ( $recent_posts as $post ) : setup_postdata($post); ?>
			<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
	<?php endforeach; ?>								
		</ul>
	</div>
</div>
<?php endif; ?>

<div class="box">
	<div class="box_title">Categories</div>
	<div class="box_content">
		<ul>
			<?php wp_list_categories('title_li='); ?>
		</ul>
	</div>
</div>
<div class="box">
	<div class="box_title">Archives</div>
	<div class="box_content">
		<ul>
			<?php wp_get_archives('type=monthly&title_li='); ?>
		</ul>
	</div>
</div>
<div class="box">
	<div class="box_title">Search</div>
	<div class="box_content">
		<?php @include(TEMPLATEPATH . '/searchform.php'); ?>
	</div>
</div>

<?php endif; ?>
</div>
</div>

More of CODE-1 Notes:

Some themes have more variations of the sidebar.php file, so look at their documentation and see where best to add the code. For instance, for the “Clear Line” theme, the code can be added in the “layouts/right-sidebar.php” file.

If your theme is not widegetized, then you can add the code anywhere you like in the sidebar. However, if your theme is widget ready, meaning that your theme supports a dynamic sidebar, then there is a limitation to where you can place the code. In this case, the code is placed at the top before the start of your dynamic widgets.

Even though I gave an example about placing the code in the sidebar. However; you can add the code anywhere you like on your WordPress Blog, specifically in your header (header.php), or footer (footer.php).

One Disadvantage of CODE-1

The Code does not display the Tweets instantly on the Blog. Meaning, if you post a tweet on your twitter account on time=X. The tweet will appear on your twitter feed instantly (time=X). However; it could take several hours for the Tweet to actually appear on your Blog (time=X+Y; where Y could be several hours.)

This is probably due to the fact that Twitter limits how frequent you can request information, or browser caching issue, or some other caching issue, or I am not sure what else. This is definitely something that CODE-1 could be improved to allow almost instant display of tweets on your Blog the minute you post them on your twitter account.

If you find a solution on how to do that, and how to modify CODE-1 accordingly, I would love to hear from you.