Basic Google Analytics - updated here: https://gist.github.com/trepmal/3389856

basic-google-analytics.php

<?php
//Plugin Name: Basic Google Analytics

new Basic_Google_Analytics();
 
class Basic_Google_Analytics {
    function __construct( ) {
        add_action( 'admin_init' , array( &$this , 'register_fields' ) );
        add_action( 'init' , array( &$this , 'load_after' ) );
    }
    function load_after() {
        if ( ! is_super_admin() )
            add_action( 'wp_head', array( &$this, 'google_analytics' ) );    
    }
    function register_fields() {
        register_setting( 'general', 'ga_number', 'esc_attr' );
        add_settings_field('ga_number', '<label for="ga_number">'.__('Google Analytics Number' , 'ga_number' ).'</label>' , array(&$this, 'fields_html') , 'general' );
    }
    function fields_html() {
        $value = get_option( 'ga_number', '' );
        echo '<input type="text" id="ga_number" name="ga_number" value="' . $value . '" />';
    }
    function google_analytics() {
        $value = get_option( 'ga_number', false );
        if ( ! $value ) return;
        ?>
<script type="text/javascript">
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', '<?php echo $value; ?>']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
</script>
        <?php
    }
}