Hi,
The captcha question when registering is:
At the very top of this page, there is a toolbar containing several links. The first reads "IT", the second reads "Developer", what does the third one say?
However, the toolbar is apparently blocked in my browser (I used Firefox 3), so not only could I not register, but I also couldn't search for help because the same captcha is required for the search form when you aren't registered.
I was able to find the answer by looking up this message on Google. I just wanted to let you know that this happened in case other people have the same problem.