This module allows subtitle to be set to blocks.
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Enable the Block Subtitle module under Administer >> Site Building >> Modules
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Once enable you need to edit block.tpl.php in your theme. Add the following code to show the block subtitle. Create the block.tpl.php in your theme if it does not exist.
<?php if ($block->subtitle): ?> <h3 class="subtitle"><?php print $block->subtitle; ?></h3> <?php endif; ?>