Add following to page, post, template where you want it to appear:

<iframe src=”http://www.facebook.com/plugins/like.php?href=<?php echo urlencode(get_permalink($post->ID)); ?>&amp;layout=standard&amp;show_faces=false&amp;
width=450&amp;action=like&amp;colorscheme=light” scrolling=”no” frameborder=”0″ allowTransparency=”true” style=”border:none; overflow:hidden; width:450px; height:60px;”>
</iframe>

Options:

• Show the friend icons under the button:  show_face=true
• Display the simple button and the count only:  layout=button_count
• Darker color scheme for your button:  colorscheme=dark
• Change the text from Like to Recommend:  action=recommend
• You can also change the width and height of the iFrame as needed

Official Twitter Button:

Add following to template within the wordpress loop (meaning after php if (have_posts()) : while (have_posts()) : the_post();) :

Adds Button with:

• share URL is the page URL
• Tweet Text is the page title
• via @your twitter name
• in english

<a href=”https://twitter.com/share” data-via=”your twitter name” data-count=”none”>Tweet</a>
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=”//platform.twitter.com/widgets.js”;fjs.parentNode.insertBefore(js,fjs);}}(document,”script”,”twitter-wjs”);</script>

Adds Button with:

• share URL is the page URL
• Tweet Text is the page title
• via @your twitter name
• in english
• shows count

<a href=”https://twitter.com/share” data-via=”your twitter name”>Tweet</a>
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=”//platform.twitter.com/widgets.js”;fjs.parentNode.insertBefore(js,fjs);}}(document,”script”,”twitter-wjs”);</script>

Shortcode to display a PDF file on your WordPress website:

The PDF is loaded through Google docs and then displayed in an iframe, on your site.
First paste the code below into your functions.php file:

function cwc_viewpdf($attr, $url) {
    return '<iframe src="http://docs.google.com/viewer?url=' . $url . '&embedded=true" style="width:' .$attr['width']. '; height:' .$attr['height']. ';" frameborder="0">Your browser should support iFrame to view this PDF document</iframe>';
}
add_shortcode('embedpdf', 'cwc_viewpdf');

Then, use the following to display a PDF.   You can define width and height to fit your website.

[embedpdf width="600px" height="500px"]http://yourwebsite.com/wp-content/yourpdf.pdf[/embedpdf]

Source: CatsWhoCode.com

WPRecipes.com

You can add your own custom help text here and customize it for different Admin panels.
For example, you can add a different help text for the Add New Post panel and another one for the Comments panel.

Place the following in your functions.php file:

add_action('load-page-new.php','custom_help_page');
add_action('load-page.php','custom_help_page');
function custom_help_page() { add_filter('contextual_help','custom_page_help');
 }
function custom_page_help($help)
{ // echo $help; // Uncomment if you want to add your Help text to the default Help text instead of replace
echo "<h5>Your Help text goes here</h5>";
echo "<p> Your HTML goes here.</p>"; }

To find what file you should add the action to, check the address bar in your browser and add the load- prefix right before the file name. For example, if you wanted to add the custom Help text to the Add New Post panel, which has a file name of post-new.php, then you would use load-post-new.php as the parameter of the add_action function shown above.

Source: SixRevisions.com

WedDesignFan.com

Your theme must support post thumbnails for this to work.

function cwc_rss_post_thumbnail($content) {
    global $post;
    if(has_post_thumbnail($post->ID)) {
        $content = '<p>' . get_the_post_thumbnail($post->ID) .
        '</p>' . get_the_content();
    }

    return $content;
}
add_filter('the_excerpt_rss', 'cwc_rss_post_thumbnail');
add_filter('the_content_feed', 'cwc_rss_post_thumbnail');

source:CatsWhoCode.com

Copy and paste into funtions.php:

function kriesi_pagination($pages = ”, $range = 2)
{  
     $showitems = ($range * 2)+1;  

     global $paged;
     if(empty($paged)) $paged = 1;

     if($pages == ”)
     {
         global $wp_query;
         $pages = $wp_query->max_num_pages;
         if(!$pages)
         {
             $pages = 1;
         }
     }   

     if(1 != $pages)
     {
         echo “<div class=’pagination’>”;
         if($paged > 2 && $paged > $range+1 && $showitems < $pages) echo “<a href=’”.get_pagenum_link(1).”‘>&laquo;</a>”;
         if($paged > 1 && $showitems < $pages) echo “<a href=’”.get_pagenum_link($paged – 1).”‘>&lsaquo;</a>”;

         for ($i=1; $i <= $pages; $i++)
         {
             if (1 != $pages &&( !($i >= $paged+$range+1 || $i <= $paged-$range-1) || $pages <= $showitems ))
             {
                 echo ($paged == $i)? “<span class=’current’>”.$i.”</span>”:”<a href=’”.get_pagenum_link($i).”‘ class=’inactive’ >”.$i.”</a>”;
             }
         }

         if ($paged < $pages && $showitems < $pages) echo “<a href=’”.get_pagenum_link($paged + 1).”‘>&rsaquo;</a>”;  
         if ($paged < $pages-1 &&  $paged+$range-1 < $pages && $showitems < $pages) echo “<a href=’”.get_pagenum_link($pages).”‘>&raquo;</a>”;
         echo “</div>\n”;
     }
}

To display call:

kriesi_pagination();

Some basic CSS to style (change to suit your site):
Copy and paste into style.css

.pagination {
clear:both;
padding:20px 0;
position:relative;
font-size:11px;
line-height:13px;
}

.pagination span, .pagination a {
display:block;
float:left;
margin: 2px 2px 2px 0;
padding:6px 9px 5px 9px;
text-decoration:none;
width:auto;
color:#fff;
background: #555;
}

.pagination a:hover{
color:#fff;
background: #3279BB;
}

.pagination .current{
padding:6px 9px 5px 9px;
background: #3279BB;
color:#fff;
}

source: kriesi.at

Smashing Magazine

Highlights

• Admin redesign
• New Default Theme “Twenty Eleven”
• Full Screen Editor 
• Extended Admin Bar
• Requirements Changes 
  • PHP 5.2.4 or greater 
  • MySQL 5.0.15 or greater
• Enhanced Browser Compatibility 
  • Drop Internet Explorer 6 support
  • Start End-of-life (EOL) cycle for Internet Explorer 7
  • Browse Happy notify users of out-of-date browser
• Faster and Lighter 
  • Faster page loads
  • Faster Upgrades

User Features

• Admin Bar: Add a Themes submenu under Appearance
• Admin Bar:
  • Add View Site/Dashboard links
  •  ‘View X’ links in the admin
  •  ‘View’ action link for terms
• Admin Bar: Support Edit link for Attachments
• Switch from “Panel/SubPanel” to “Screen” in inline documentation and Codex links
• Add collapse link to admin menu
• Help Tab text updates
• Favorites menu no longer exists

Dashboard

• Change View All Buttons into plain links
• Show full set of status links in recent comments box
• Drop “Change Theme” button
•  ”Update Automatically” changed to “Update Now”

Posts

• Change Menu Name from ‘Posts’ to ‘All Posts’
• Show the sticky posts checkbox (“Stick this post to the front page”) Only when author has ‘edit_others_posts’ capability
• Updated styles for the Visual editor buttons
• Full screen editor experience called Distraction Free Writing

Media

• Add ‘Add New’ button to edit media

Links

• Change Menu Name from ‘Links’ to ‘All Links’
• Add ‘Add New’ button to edit links

Pages

• Change Menu Name from ‘Pages’ to ‘All Pages’

Comments

• New comment bubble styling

Appearance

• New Default theme – TwentyEleven

Tools

• Change Menu Name from ‘Tools’ to ‘Available Tools’
• Press This bookmarklet redesign
• Export commentmeta

Users

• Change Menu Name from ‘Users’ to ‘All Users’
• Add ‘Add New’ button to edit users

Multisite

• Show access denied page and list a user’s sites if they visit an admin they don’t have permissions
• Make “Space Used” gray instead of green in multisite Right Now box
• Make user validation when adding a user via network admin consistent with adding a user elsewhere and provide better feedback for validation problems
• Allow Pagination for Must-Use/Dropin plugins; respect WP_CONTENT_DIR & WPMU_PLUGIN_DIR for help text; move help text into WP_Plugins_List_Table
• Rename network admin submenus to not clash with top level menus