How to create a dropdown menu of tags

Simply paste the following code where you want the dropdown menu to be displayed. Note that you can use your own taxonomy: Just modify the code on line 5 according to your needs.

<h2><?php _e('Posts by Tags'); ?></h2>
<form action="<?php bloginfo('url'); ?>/" method="get">
<div>
<?php
$select = wp_dropdown_categories('taxonomy=post_tag&show_option_none=Select tag&show_count=1&orderby=name&echo=0');
$select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
echo $select;
?>
<noscript><div><input type="submit" value="View" /></div></noscript>
</div></form>

Thanks to WP Lover for the code!