So, ever since the betas of MT4, I've been unable to make AIM's OpenID play nice with my installation of Movable Type and I was wondering if anyone had any insight into why. This problem is still present for me in the latest svn checkout of MT4.
Whenever I try to comment on my installation with http://openid.aol.com/screenname , I receive an error. However, this does work on other people's installations (in fact, it works on this forum). I set up a test entry at http://mt-test2.cowsandmilk.net/test_blog/2007/12/aim-openid-commenting.html to give an example.
My mt-check is at http://mt-test2.cowsandmilk.net/cgi-bin/mt-check.cgi
So, since it works on other people's installations and not mine, I'm lead to believe there's something wrong with my configuration.... Any help would be appreciated.

You should consider installing the AIM OpenID plugin - it will provide a better experience for your users I think. But this will NOT solve your problem.
I am thinking your problem has to do with missing libraries - perhaps a missing SSLeay package or Net::HTTPS? AOL requires HTTPS and without it, auth will fail.
I installed libcrypt-ssleay-perl from the Ubuntu package servers and that fixed it. Thanks!