Indeed. It's pretty much impossible to block by IP and one of the reasons they are so full of random crap is to try and include as many keywords as possible that will help them get through automated spam blockers. OCR is getting better at defeating CAPTCHAs so it is getting really hard to stop them.
Sometimes they don't even care if 'us forum folk' click a link from here, they are just trying to get thier links out to so many places that they get picked up and rated higher by spiders so that you find thier crap when you search for legitimate things.
These guys are using OCR to get by captcha tools and sometimes you won't even see a link to click because they
