This app can handle every aspect of pulling together a screencast, from high-quality screen capture (including grabbing iSight and DV camera data, and mic and computer audio) to editing and exporting, with built-in YouTube publishing. If you're looking for a way to capture the activity on your screen--for whatever purpose--ScreenFlow is one of the best apps of its kind for the Mac.
Also this week, we have the latest update for iFFmpeg, the free, easy-to-use front end for the powerful command-line tool FFmpeg, which lets you easily convert media files between different formats. Our game this week is Battle for Wesnoth, a free, open-source strategy game that's nothing to write home about graphically, but offers tons of content and challenging gameplay that will appeal to any strategy gaming fan.
Don't forget to check out this week's iOS app collection: Games that swing on iOS.