Today I found quite nice plug-in for WordPress pretending that it will block at least 90% of the spam attempts. Quite ambitious indeed, but the time will show.
The general idea is that this plug-in adds a stylesheet to your blog’s html source code. When a browser loads that stylesheet a cookie is dropped. If that user then leaves a comment the cookie is checked. If it doesn’t exist the comment is marked as spam.
Installation is just plug-activate-play. Let’s see what will happen.