Telestream's ScreenFlow, which creates screencasts, has been updated to version 2.0 (see "ScreenFlow: Screencasting on Steroids," 30 April 2008). The new version adds much-needed (and long-rumored) features such as transitions between video clips, the capability to speed up or slow down a portion of a clip, separation of audio from video, audio ducking, moving clips between documents, pause during recording, and many performance and editing improvements. ScreenFlow 2.0 includes a Flip4Mac WMV Studio serial number (a $49 value); it requires Mac OS X 10.5 Leopard or later and Quartz Extreme. A trial version watermarks exported movies. ($99 new, $29 upgrade, 7.8 MB)