Recently I converted my vB site over to the latest UBB and completely solved my spam problem. With vB I was deleting spam almost hourly some days, but now, I've not had a single spammer sign up and try to post. Good decision.
Greg AKA Virgil Earp at the OK Corral Tombstone, AZ
"We are the official hosting company of UBB.threads. Ask us about our free migration services to migrate your UBB.threads installation."
I currently have a Vb forum up and I know what you mean. I have a stop spam hack installed and thus far it has stopped over 16K+! I like Vb but I find that if you don't place your site in their directory the spammers are not quite as bad.