Have you found the gallery shorttags documentation?
Yes I have looked at the Gallery shortcode but my take away for that documentation is that I can change the size of the gallery image displayed in the post. I cannot find or do not understand how to get the next page to show the full image. Watching Matt’s screen cast makes it seem like a standard feature of the gallery that does not require tweaking of the code.
Gallery Shortcode Documentation in Codex.
Please provide the Example Blog you talk about. When I make a test with a plain install I can not see any difference to what you describe. Looks like this is the standard way.
I think I found out how to do it:
Find out function wp_get_attachment_link in your post-template.php file (located in wp-includes) and change it to look like this (one extra code line, one extra comment line):
// get an attachment page link using an image or icon if possible
function wp_get_attachment_link($id = 0, $size = 'thumbnail', $permalink = false, $icon = false) {
$id = intval($id);
$_post = & get_post( $id );
if ( ('attachment' != $_post->post_type) || !$url = wp_get_attachment_url($_post->ID) )
return __('Missing Attachment');
if ( $permalink )
$url = get_attachment_link($_post->ID);
$post_title = attribute_escape($_post->post_title);
$link_text = wp_get_attachment_image($id, $size, $icon);
//modification introduced to force the gallery shortcode thumbnail hyperlink to the full size image directly, rather than the attachment page
$url = wp_get_attachment_url($_post->ID);
if ( !$link_text )
$link_text = $_post->post_title;
return "<a href='$url' title='$post_title'>$link_text</a>";
}