Yes, it is fixed. I was able to successfully create an account just now. After you press "Accept" on the page where you typed in a username, password, CD key, and email address, a new window came up that said the account was successfully created. I was also able to log on immediately.
Apparently there was some kind of server-side problem that was going on. I emailed Ironclad with the same description as the original post here and received the following response:
<<<
Hi Keith,
We were having some issues earlier with account creation, they have since been resolved. Please try to create your account as you did before.
Stephen
Technical Support
Ironclad Games
>>>
So go ahead now and just try again if you have not.