Like many other people, I'm seeing a huge uptick in comment spam apparently written by humans. The comments are on-topic and sometimes even thoughtful, but they invariably link back to some cheesy commercial site. Akismet is slowing but not stopping them.
My question: has anyone tried entirely disabling the URL field in the comment form? If so, does that deter human spammers, since without the link they won't get paid? Or do they blindly comment anyway?