I'm well aware of how IPs work - as it is, banning them is really the only option to try to prevent anything. We HAVE seen repeat IP spams, and IPs aren't nearly as dynamic as they once were.
You'll find that most of my replies are in general, as in not just for the poster themselves, but also for users who will visit posts in the future looking for the same information.
We have no desire to require registration, and especially not email confirmation (I find boards that do that terribly annoying). Maybe that will result in more spam, but that's not really the issue here - I'm only hoping that banning can be made easier.
Semi offtopic, but 7.1 (currently in beta) has a CAPTCHA system built in, its abilities include guest postings so that will be one way to aid in spambots if you don't require registration or email verification. Additionally the CAPTCHA will cover the registration system to help aid in bot registrations.
