What application(s) should I use to make a quality screencast on a mac? I'd like to get into making some screencasts on my mac. I've seen many quality mac screencasts on Youtube including this video and another example. I would like to achieve this kind of quality, I just don't know what applications people are using.

A few people have asked about this on MF, but this post is from 2006, and even a more recent post from 2009 only mentions Screenflow and iShowU HD.