As a codacil to that story, here are some more recent bits of info. To this date, no government action has been taken to benefit or support Mr. Arar at all.
National news sources have revealed that CSIS (our token version of the fbi) and the Mounties traded confidential information about him to U.S. agencies during the affair. In addition to this underwhelming support of Canadians in trouble overseas, our gov't has publicly stated that it will not support or help any Canadian citizen in trouble with foreign authorities, or interfere in any way with criminal proceedings against Canadian citizens in foreign countries. Doesn't that just warm the frickin' cockles of your heart. It doesn't affect me, because I'm a fulltime university student, and I won't be travelling anywhere on my own dime until 2025 at least.
Cheers,
Owlkat