I post on a newpaper site's blog that requires RECAPTCHA for the first post. Then it sets you a cookie and you can continue posting for the rest of the day, even if you go to other websites. The next day, same procedure. It is very efficient at keeping out spammers.
BRING ANDY HOME I realize that I'm generalizing here, but as is often the case when I generalize, I don't care. ~ Dave Barry