Views module breadcrumbs make no sense to me when using arguments - how can I customize breadcrumbs?

But never fear, it isn't too terrible. In fact you could put all your breadcrumb code in template.php

For it to work right you need to set breadcrumbs in preprocess

function phptemplate_preprocess(&$vars){
}

This will give you access to drupal_get_title().

Here is some sample code of what I did recently:

function phptemplate_preprocess(&$vars){
  //set breadcrumbs
  _phptemplate_set_all_breadcrumbs($vars);
}

/**
 * Set all breadcrumbs
 * 
 * This function is a central place to set breadcrumbs for the entire site
 */
function _phptemplate_set_all_breadcrumbs(&$vars){

  $path = drupal_get_path_alias($_GET['q']);
  $node = menu_get_object('node');
  $node_type = $node->type;
  
  /**
   * First check for node item
   */
  if ($node_type) {
    switch($node_type) {
      case 'ammunition_ballistics':
        drupal_set_breadcrumb(array(l('Home',''), l('Ballistics Chart','ballistics-chart'), l(drupal_get_title(), $path, array('html' => TRUE))));
        break;
      case 'gun':
        drupal_set_breadcrumb(array(l('Home',''), l('Gun Directory','gun-directory'), l($node->title, $path, array('html' => TRUE))));
        break;
      case 'guide_entry':
        drupal_set_breadcrumb(array(l('Home',''), l('G&A Guide','ga-guide'), l(drupal_get_title(), $path, array('html' => TRUE))));
        break;
      case 'article_guns':
      default://default to home and title
        drupal_set_breadcrumb(array(l('Home',''), l(ucfirst($node->current_channel), $node->current_channel), l($node->title, $path, array('html' => TRUE))));
    }
  }
  /**
   * Then check paths
   */
  else {
    //user/my g&a page
    if (preg_match('/^user(\/\d+)?/', $path))
      drupal_set_breadcrumb(array(l('Home',''), l('My G&A', 'user')));
    //user register
    elseif (preg_match('/^user\/register.+/', $path))
      drupal_set_breadcrumb(array(l('Home',''), l('My G&A', 'community'), l('What\'s My G&A?', 'whats-my-ga')));
    elseif (arg(0) == 'admin'){ 
     // don't do anything
    }
    //default
    else {
      drupal_set_breadcrumb(array(l('Home',''), l(drupal_get_title(), $path, array('html' => TRUE))));
    }
  }
}