I attempted to login to this today as I was preparing a blog article on the topic. After I was redirected to your site it failed to log me in.
I noticed a few bugs with URL handling on our side of the fence. I would really like to get the kinks worked out so we can all switch to BitShares login and start getting some extra benefits out of our BitShares accounts.
I will look in this. It was working well for me with only 1 known bug in the log display screen which shows an invalid URL for profiles.
2 possible problems or something has went down on the server.
1) If you patched the URL variable handling so they are passed through it will break the login as I rely on the code behaving as it does.
2) If you were trying to login in with an account you created when I first made this thread then the behavior isn't defined. I released the site initially just for fun etc. It was a prototype where I did the first bit of coding to get it to work. Things have changed since then so I wouldn't expect the accounts made during that time to work, but they might.
You can also claim accounts and synch them up but I have to test the functionality. It appears that if you create an account without bitshares then try to login with an account, it will attempt to synch your accounts if you provide a password. I plan on working on this today (tonight), running testcases etc and verifying some cookie behavior. I also need to allow a person to enter an empty blank email.