Many wordpress users sometimes needs to remove their post tile. In that case refer these steps:
1) Open the index.php file of your active theme.
2) Find this code:
<h2><a href=”<?php the_permalink() ?>” rel=”bookmark” title=”Permanent Link to <?php the_title_attribute(); ?>”><?php the_title(); ?></a></h2>
3) Remove this code and save the file.
Note: Whenever you change the theme for your blog, your post title comes back. In this case, upon changing the theme you also need to remove asbove code from new themes index.php file