Wordpress archives page showing all posts in reverse chronological order, sorted by year then month with nested lists.

Sorted, nested Wordpress archive

<?php
/*
Template Name: Master Archives Page
*/
?>

<?php get_header(); ?>

<article class="archive-list">

  <h2>Blog Archives</h2>

<?php
  // Timeliness variables
	$month = '';
	$year = '';
	$prevmonth = '';
	$prevyear = '';

	// We want to treat the latest month and year differently
	$latestmonth = '';
	$latestyear = '';

	// Switches, because we want to do something special at the start of a new month and year
	// Default 1 (true)
	$newmonth = 1;
	$newyear = 1;

	// Cycle through all the posts to display the archive
	query_posts('showposts=-1');
	
	// All right, let's get into the loop
	if (have_posts()) : while (have_posts()) : the_post();

		// Find the month/year of the current post
		$year = mysql2date('Y', $post->post_date);
		$month = mysql2date('F', $post->post_date);

		// If latest month/year haven't been set yet, we know them to be this month/year
		if ($latestyear == '') $latestyear = $year;
		if ($latestmonth == '') $latestmonth = $month;

		// Check if the year and month have changed
		if ($year != $prevyear) :
			$prevyear = $year;
			$newyear = 1;
			// Additional check for same month in different year
			if ($month == $prevmonth):
				$newmonth = 1;
			endif;
		endif;
		if ($month != $prevmonth) :
			$prevmonth = $month;
			$newmonth = 1;
		endif;

		// If it's a new year, let's spit out a year heading
		if ($newyear) :
			// If the new year isn't the latest year, let's close off the year group
			if ($year != $latestyear): ?>
						</ul>
					</li>
				</ul>
			<?php endif; ?>

			<h3><?php echo $year; ?></h3>
			<ul id="<?php echo $year; ?>" class="year-group">

			<?php // Don't reset $newyear yet, because the month calculation depends on it
		endif;
		if ($newmonth) :
			// If we're a month in the same year, let's close off the month group
			if (!($newyear)): ?>
					</ul>
				</li>
			<?php endif; ?>
			<li><h4><?php echo $month; ?></h4>
				<ul id="<?php echo $month . $year; ?>" class="month-group">
			<?php $newmonth = 0;
		endif;
		// Now set to false if it wasn't already false
		if ($newyear): $newyear = 0; endif;

		?>

		<li><?php echo mysql2date('jS', $post->post_date); ?>: <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>

		<?php

	endwhile; endif;
?>

</article>

<?php get_footer(); ?>

Hello!
This is really nice. I was wondering how to get the number of posts of each month.

All the best.