ScreenFlow

http://www.telestream.net/screenflow/

With ScreenFlow screencasting and screen recording software, capture the contents of your Mac desktop, your video camera, microphone and computer's audio.

Macの動画キャプチャソフト。他のソフトだと動きがもっさりしてしまうことがありますが、ScreenFlowならサクサクぬるぬる！