Apple today released QuickTime 6.1 via the Software Update control panel. According to Apple, the new version delivers "a number of quality and performance enhancements for audio, video, and full screen playback. Enhancements include the following: MPEG-4 video provides more accurate rate control and improved visual quality. AAC includes new encoder controls and new bit rate options. DV includes significant encode and decode performance improvements. QuickTime Pro users will enjoy enhancements in full screen playback, including newly enabled keyboard shortcuts for movie control, faster entry and exit, and improved playback performance."