Well, there's also TubeTV, (found on the Apple downloads page). http://www.apple.com/downloads/macosx/video/tubetv.html
It works just as well, if not better than iSquint and VisualHub, due to the fact that IT browses the web, and directly takes the video. No need for going to
Window->Activity, and then scrolling through, finding the video, and then saving an FLV copy to your HD, then converting. It takes the vid directly, then has encoding options, and allows you to add to your iTunes library. Trust me, it's great, and FREE. 😀