Gmail CAPTCHA broken?

I just read, through a link provided by Julen, that apparently Gmail CAPTCHA has been broken (referred to at Slashdot).

This CAPTCHA in particular is the one Google asks a new user to identify correctly to create a new Gmail account. If a robot, or any other automated process, is able to make the correct guess and pretend is a legit user, this opens the doors for massive amounts of new Gmail accounts for spammers. We'll see what comes out of that (more spam, probably).