I use WordPress to host a comic at http://prequeladventure.com/ . Up until now, I've been kept spam-free using the simple "Comment Quiz" plugin. However, a couple days ago hundreds of spam comments began slipping past my quiz - sometimes up to one every minute! My moderation queue catches most of them, but I prefer systems that keep the spam from ever being sent.
I tried a few different quiz questions, tried ReCaptcha, and so far nothing has stopped the spam. A moment ago I even tried an impossible-to-answer spam question (featuring over 50 alphanumeric characters and no clues) and the spam is still coming in.
At this point I think it's safe to assume the spambots are somehow slipping past all my comment requirements. Has this happened to anyone else, and is there any way to fix this?