The easiest way to implement an unusual Captcha with images instead of text and drag & drop capabilities.
If the authors keep adding just a little more spit and polish this will be a 5 start captcha soon.
The add a hook on the fly feature is a fantastic idea.
The using Google CDN for jQueryUI is a little questionable, not exactly WP best practices.
Multisite seems broken, which is the real shame here. It works on some sites and not others, using the same theme. (Remember, I know how to add hooks, it' not that or a jQuery issue, the actual images are broken) The issue is how it carries sessions using cookies. I think there may be a better (more reliable) way to handle this but I'm not sure how yet. For a free, self hosted product, I can't complain too much, these guys did really well and kudos to them for releasing it into the wild.
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