Selecting one post, using meta

The template tag, query_posts(), has the “Custom field parameters” meta_key= and meta_value=.

Example:
<?php query_posts ('meta_key=cf1&meta_value=cf1 value here->'); ?>

or
<?php query_posts ('meta_key=cf1'); ?>

or
<?php query_posts ('meta_value=cf1 value here->'); ?>