Abe,
Do you know what I'm missing for Image Verification in your form hack? I've asked here and have another thread over in Programming Discussion. If I could get it figured out I would really like to release it to you so that you can update your hack to use Image Verification for Unregistered users.
Like I said before, I just need it to SHOW that the form has been rejected. Everything works though.. it just doesn't tell you.

Right now I'm using a very large disclaimer above the code box that warns unregistered users that they should triple check what they've typed in, because they won't know if it's been submitted for sure or not.
This is a terrible solution though, because a lot of people will have doubts and try submitting it twice.. a nightmare from a moderation standpoint.