If for any reason you need to hide any content's header in the front page of your Joomla! 1.5 site, it can be easily achieved. Edit the file locate at joomla_root/components/com_content/views/frontpage/tmpl/default_item.php and chage the code as follows:

Near line 13, change this code

if ($this->item->params->get('show_title')) :

For this one:

if ($this->item->params->get('show_title') && $this->item->id != #) :
Please note that you must change # for the id of the article you want to hide the title for.