Sending SPAM bots to a blackhole

Question

I have a few forms on my site that have been getting hammered by SPAM bots lately. I've finally got it under control (without the use of a captcha).

Basically, I'm checking the form for various flags. If detected, I simply redirect them request to google.

Is there a way to redirect the bot either back to it's IP address, or some kind of infinite loop that will possible slow it down, or at least cause a minor headache for the person behind it?

CLARIFICATION:

I am already blocking the SPAM, I'm looking for a clever way to irritate the spammer once I redirect them.

Answer 1

Once one of my teachers told us that they developed a sort of anti-spambot honeypot. It was pretty simple, it redirected bots to a dynamic-generated page which contained an infinite loop of fake addresses. The aims where two: keep them busy and fullfill their DB with unusable email addresses, damaging the spammers. This was just an idea, i don't know if it fits your needs but..it's worth the shot^^ Of course, it's easier to simply drop spambot-related request if you are able to identify them..