How to use PHP 5.3 for Site5 shared hosting account

As I was getting ready to test an update to the Drupal Evernote Module on my live site, I got hit with all sorts of funky errors that lead me to believe there was something wrong with using some of the PHP 5.3 features around namespacing. It was pretty easy to get around, but requires a hack to Drupal's .htaccess file:

AddHandler application/x-httpd-php53 .php

Add that to the top, and now if you do a quick phpinfo(), you'll see that your site is using PHP 5.3.