example on how to modify queries with filters in wordpress

gistfile1.txt

//---------------------------------
// Modify these taxonomy pages to show all posts
// and sort them alphabetically
//---------------------------------

add_filter('posts_orderby', 'mashcat_alphabetical');
add_filter('post_limits', 'mashcat_limits');

function mashcat_alphabetical($orderby) {
  if(!is_admin() && (is_tax('foreign-apis') || is_tax('api-tags') || is_tax('mashup-tags'))) {
     return 'post_title ASC';
  }
  return $orderby;
}

function mashcat_limits($limits) {
  if(!is_admin() && (is_tax('foreign-apis') || is_tax('api-tags') || is_tax('mashup-tags'))) {
     return "";
  }
  return $limits;
}