change site name and such based on path.

mymodule.php

<?php
function mymodule_init(){
  global $conf;
  if(drupal_is_front_page()){
    $conf['site_name'] = "WELCOME TO THE FREAKING HOMEPAGE!";
    // $conf['other_vars'] = "to change";
  } else {
    switch($_GET['q']){
      case 'node/12345':
        $conf['site_name'] = "this node is awesome!";
        break;
      case 'some/view/path':
        // yep
        break;
    }
  }
}
?>