Having switched to using a mac almost a year and a half back. I generally keep track of screencasting apps for the mac. The unofficial apple weblog (tuaw) has a very good review of screencasting apps for the Mac. Check out the review and let us know which apps you prefer by writing in or better yet, put it up on our Mac screencast wiki page.
I personally have always used IShowU for capture and Quicktime-Pro for all my editing, but with the entry of all these options maybe I will check some of these out.
-hari
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