Display custom field(s) as a drop-down

hi there,
i’m using the following bit of code to display categories as a drop-down;

<form action="<?php bloginfo('url'); ?>" method="get">
        <?php wp_dropdown_categories('show_count=1&hierarchical=1'); ?>
        <input type="submit" name="submit" value="view" />
</form>

i’d like to be able to do something similar for a custom field on posts.
is this possible?
thanks in advance…
Jas