QuickTime
Change the playback speed of a QuickTime movie
06/03/2010
When playing a movie in QuickTime X on a Mac with a multi-touch trackpad, do a two-finger swipe across the movie to change its playback speed.
Exclude silent portions of QuickTime movies when trimming
04/07/2010
When trimming a movie using QuickTime Player in Snow Leopard, do Edit>Select All Excluding Silence to exclude beginning or end portions containing no sound.
Adjust the playback speed of a QuickTime movie
03/30/2010
While playing a movie in QuickTime Player, click the forward or reverse arrows to play it at 2X, 4X or 8X speed. To resume normal speed, click the Play button.
Jump to the beginning or end of a movie in QuickTime Player
03/04/2010
When playing a movie with QuickTime Player in Snow Leopard, hit Option-Left or Option-Right Arrow on your keyboard to quickly jump to the beginning or end.
Show audio when trimming video with QuickTime X
01/02/2010
When trimming a video clip with QuickTime X in Snow Leopard, press the Option key to show the audio waveform in the timeline.