http://xemele.cultura.gov.br/blog/2008/05/15/gerenciador-de-capas/

http://www.blogohblog.com/10-new-plugins-for-wordpress-3-0/

From http://noel.io/tweet-this-wordpress-function/

function tweet_this() {
global $post;
$tweet = sprintf( __('Currently reading %1$s %2$s'), $post->post_title, wp_get_shortlink() );
echo '<a class="tweethis" rel="nofollow" href="http://twitter.com/home?status=' . urlencode( $tweet ) . '">' . _e( 'Tweet this' ) . '</a>';
}


a.tweethis {
background: #73A4FA;
padding: 3px 7px;
color: white;
border-radius: 4px;
}
a.tweethis:hover {
background: #333;
}