Despite the spamming angle, I think CAPTCHA-breaking is, on the balance, noble and honorable work. These things are user-hostile blights on the web, and any effort towards making them disappear as useless is worthwhile. Sites worried about spam should invest more in automated spam classification/elimination instead of punishing real users with CAPTCHA-solving. Not that I can offer a solution--if I could, I'd be a millionaire.
Who do you think spam classification false positives are going to be pubishing if not real users?
At least with a captcha, you have some idea that you were rejected before you put in the effort to write your comment.
