Shloime Henig contacted me a few days ago to point out a HUGE issue he found with my anti-spam form submissions technique. I use a number of hidden form fields that a standard user will not see to help me separate the good users from the spam bots. The problem, as Shloime pointed out, is that if any one has form auto-fill turned on in their browser (via some Browser plugin or what-have-you), it will alter the hidden fields unbeknown to the user.
Altering these fields, of course, makes my code thing that the form was submitted by a spam bot and rejects them. I am sorry if this has happened to any of you (getting your comments rejected). I am going to be moving to a much more simple technique (version 4) very soon.
Thanks Shloime, you rock!