I made a child theme so that I would not lose all of my changes if and when Twenty Ten gets updated. In the theme I have removed tags, removed ‘posted on’ date, changed the header image size and added a thumbnail to each post by changing the <div class>. To add the thumbnail, there are four <div class=”entry-content”> in the twentyten loop.php, I use this code on div three and four:
<div class="entry-content">
<?php /* if we have a thumbnail then show it */ ?>
<?php if(has_post_thumbnail()): ?>
<div class="cms-image" style="float: left; margin: 5px 5px 0 0;">
<a>"> <?php the_post_thumbnail(); ?></a>
</div>
<?php endif; ?>
<?php the_excerpt(); ?>
<?php /* REMOVED the_content( __( 'Continue reading <span class="meta-nav">→</span>', 'twentyten' ) ); */ ?>
</div><!-- .entry-content -->