Well besides wondering how it got through the captcha, or if Yahoo actually has people paid to help it out, Yahoo is going to be indexing the site as a member, or did someone actually register as Yahoo [Bot]?
Edit: As is Google [Bot]?
Edit #2: The reason I bring this up is to find out how often they're going to be indexing the forums, and whether this could potentially start costing Wraith some large chunk of cash when they start looking through hundreds or thousands of threads instead of dozens...