The requirement to add URLs to "Fav Sites" is ridiculous, especially considering my favorite site, http://caves.org does not meet the "minimum of 25 characters." Useful site, awesome plug-in, BULLSHIT registration field. Either don't make it mandatory or accommodate us bit.ly and tinyurl folks, eh? While I'm at it, there should be an easy-to-find "Send PM to Site Admins" button or something like that, so I don't air my dissatisfaction to the entire forum! Thanks!
I think the favorite sites thing is just to keep bots from creating accounts. It's a pretty common thing to have a random question in place of a CAPTCHA.
Ace is right, it's meant to prevent some of the bot registrations. I'm sorry it caused you frustration. I left a note for Jason about it so we improve it. Thanks for the feedback.