I have taken a few steps to further combat spam on this site:
1. On the custom registration challenge, I've changed it so you now have to click the second occurrence, not the first, of the letter Z, this might slow down automated registration bots.
2. You cannot use a signature until you have 3 posts.
3. Your first 3 posts require approval by a moderator, this was unintentional, but it seems I couldn't achieve 2. without this happening too. wendy, I hope this is alright with you? Any other volunteers for moderators?