Well done DT. Indeed bot registrations are becoming a pain in the admin harris.
At MGs on Track we run an old version of vB3 with just a simple captcha and have had over 12500 since the beginning of Dec with 85 of them genuine users.
Moving over to ZenForo soon when the new website is finished but few expectations that it will make the spam registratation any better.
the picture thing we had on here before the upgrade to vb4 was working a treat, and now is on the vb3 install over on Aria forums. There’s a program called xrumer that automates the bot stuff and is becoming more and more available I’ll put in the picture stuff on vb4 at some point, the akismet anti-spam does a good job of sending spam to the post moderation queue