Personally I like the human acceptance of new members method, but this can be annoying if large volumes of bot traffic is coming in and thus makes it harder to weed out the genuine humans.
Some of the suggestions on here are ones I have used in the past (and the custom registration question and Q&A authentication are two of the best when used properly).
The restriction of new members posting is possibly one of the best (users with <25 posts would have to have each post manually approved by a mod) - this is one that not keeps the spammers out it also helps wheedle out hate posts by humans looking for traffic links to their own blogs etc).
just a few suggestions I can think of that could fit with the friendly approach of the MR site, without coming across as overly draconian or unfriendly.
Some of the suggestions on here are ones I have used in the past (and the custom registration question and Q&A authentication are two of the best when used properly).
The restriction of new members posting is possibly one of the best (users with <25 posts would have to have each post manually approved by a mod) - this is one that not keeps the spammers out it also helps wheedle out hate posts by humans looking for traffic links to their own blogs etc).
just a few suggestions I can think of that could fit with the friendly approach of the MR site, without coming across as overly draconian or unfriendly.