I was wondering whether or not to flag this, but decided against it on the off chance that people hadn't heard of it.
I find ReCAPTCHAs very easy to fill out, myself. I've never had one wrong yet. If it's doing good at stopping bots, then it's absolutely a prime solution.
Plus, one of them is so bad that OCR software couldn't recognize it.
Wait, what?! I think you don't quite understand the premise of CAPTCHAs.