Sort Blog posts by Post Type

Sorry, I meant that since I couldn't figure out how how to simply sort by type I'm having the user select a post type, which is the template for the post, but then also go and select a section to put it in, which is how I'm actually sorting them for display on the site.

Thanks Drew, got that figured out, but I'm having trouble filtering posts for previous/next links within a post. I can't seem to figure out why this code isn't working:

<?php

  $slug = perch_get('s');

  $html = perch_blog_post($slug, true);

  $data = perch_blog_custom(array(
    'filter'=>'postSlug',
    'match'=>'eq',
    'value'=>$slug,
    'skip-template'=>true, 
  ));

  $data = $data[0];
  $date = $data['postDateTime'];

  $prev = perch_blog_custom(array(
    'sort'=>'postDateTime',
    'sort-order'=>'DESC',
    'filter'=>array(
      array(
        'filter'=>'postDateTime',
        'match'=>'lt',
        'value'=>$date,
      ),
      array(
        'filter' => 'postTemplate',
        'match' => 'eq',
        'value' => 'posts/comic.html',
      ),
    ),
    'count'=>1,
    'template'=>'post_prev.html'
  ), true);

  $next = perch_blog_custom(array(
    'sort'=>'postDateTime',
    'sort-order'=>'ASC',
    'filter'=>array(
      array(
        'filter'=>'postDateTime',
        'match'=>'gt',
        'value'=>$date,
      ),
      array(
        'filter' => 'postTemplate',
        'match' => 'eq',
        'value' => 'posts/comic.html',
      ),
    ),
    'count'=>1,
    'template'=>'post_next.html'
  ), true);

  ?>

It seems not to output anything, but I think I found a different solution anyway. Realized the next/previous links really need to be within categories anyway, so I'm filtering by category now and that seems to work fine. Thanks!