A bit more than a week ago we demoed a new Orchard module of us on the Community Meeting, Antispam. The module contains only one small but useful feature, a content part (JavaScript AntiSpam Part): this part prevents clients not running JavaScript from posting content item editor forms. What this means is that content item forms (like comment forms or contact forms) employing this part can't be posted by spambots, since spambots commonly don't support JavaScript fortunately.

Following the decision on the meeting we also quickly added this feature to the built-in Orchard.AntiSpam module, so if you're running the latest Orchard source (like the Lombiq sites do) you can already use JavaScript AntiSpam Part! We use it and it really works!