I've been looking forward to the anti-spam features ever since I saw the first changeset. Is there any chance you'll also work on the captcha, too? I know a few people (myself included) would prefer something like reCaptcha integrated into the script.
There's a little problem with reCaptcha... one has to register with them to make it work. This complicates installation. We're looking at it though, might just make an extra module.