They changed their tune over at my.opera.com on 10 March 2007 and the image-based CAPTCHA was replaced with a text-based one. No doubt the folks at Opera were tired of dealing with SPAM Bots that danced their way around the CAPTCHA images, so they decided to give text phrases a try.
This is actually the first time that I’ve seen a major popular site working with text-based CAPTCHA, and I was kind of surprised. Popular sites like my.opera.com are often the targets of specialized SPAM Bots that are designed specifically to defeat that one site’s defenses. Apparently the text gates are holding strong in this case, because they are still employing it.