Seperate page.tpl files

I know there's a handbook page on it somewhere, but I can't seem to find it right now. What I do is put the following in my page.tpl.php:

if ($is_front) {
  include 'page-home.tpl.php';
}
else {
  include 'page-main.tpl.php';
}

And then page-home.tpl.php and page-main.tpl.php have the real content. You can, of course, have however many if-elseif statements you need and use whatever checks you need. ($is_front, checking the path with arg(), whatever.)

Bunch of examples here (links at the bottom).
http://drupal.org/node/46006