mulitple looping

i’ve read the codex about multiple looping.

<?php while (have_posts()) : the_post(); ?>
// my normal stuff
<?php endwhile; ?>

<?php rewind_posts(); ?>

<?php while (have_posts()) : the_post(); ?>
// Do other stuff.
<?php endwhile; ?>

Here’s my plan. When I click on a monthly archive or Category, it will show 5 most popular/most commented post in the first loop. The 2nd loop, it will show all the post in that month/category (permalink, not full post or excerpt).

My question here is:

1. how do i get the first loop to call out the popular/most commented posts in that certain month/category? is there a plugin to it?

2. how do i get the second loop to call out ALL the post for that certain month/category, if my blog preference is set to display 10 posts per page?

Thanks