Same problem here, about 10 spam registrations a day.

So the catcha tool isn't good enough.

There are some admin tools like blocking names and sets of IP addresses but they have had only slight success I feel, and the IP block did temporarily ban two members who are in France, so we need another tool.

One I thought would be useful for my site would be to block any registration that doesn't set English as the language. I think most of the spam regs don't select language so it's always Arabic on their profile.

Another tool would be a Question that has an answer you need to think about, like 'What is the colour of a banana?' Something like that.

We need someone in bizhat admin to post on this thread. Any chance of that?

John