Get ‘Alternate Text’ from attachments

Hi,
I’m looping through image attachment to display images and thumbnails for a portfolio page using WordPress (of course). I’m trying to pull the data from the new “Alternate Text” field available for WP 2.9 but I’ve been unable to find where this data is stored.

I’m able to get data from the other fields using the below code but where is ‘Alternate Text’ field info?

Here is what is entered in the WP back-end for this image:
Title: Personal1L
Alternate text: Personal 1 Alt Text
Caption: Personal 1 Caption
Description: Personal 1 Description
Link URL: (its blank)

Here is the output of the below code for this image:
ID: 53
post_author: 1
post_date: 2010-01-27 06:33:52
post_date_gmt: 2010-01-27 06:33:52
post_content: Personal 1 Description
post_title: Personal1L
post_excerpt: Personal 1 Caption
post_status: inherit
comment_status: closed
ping_status: open
post_password:
post_name: personal1l
to_ping:
pinged:
post_modified: 2010-01-27 06:33:52
post_modified_gmt: 2010-01-27 06:33:52
post_content_filtered:
post_parent: 30
guid: http://localhost/sitename/wp-content/uploads/Personal1L.jpg
menu_order: 4
post_type: attachment
post_mime_type: image/jpeg
comment_count: 0
filter: raw

And here is relevant code:

<!--This is happenening inside the Loop-->
<?php
$args = array(
  'post_type' => 'attachment',
  'numberposts' => -1,
  'post_status' => null,
  'post_parent' => $post->ID,
  'post_mime_type' => 'image',
  'orderby' => 'menu_order',
  'order' => 'ASC',
  );
?>
<?php $attachments = get_posts($args); ?>

<?php if ($attachments) { ?>
	<?php foreach ($attachments as $attachment) { ?>
		<!--Loop through attachements (images) -->	

		<?php foreach ($attachment as $key => $value) {?>
		  <!--Loop through each attachement (image) and display all associated key : value pairs-->	

          <p><?php echo $key; ?>: <?php echo $value ?></p>

		<?php }; // nested foreach ?>

		<!--End loop through attachements-->
	<?php } //foreach ?>
<?php } //if ?>

Thanks!
John