MacOS Lion - Dock History löschen
Lion lists recent items with each application in the Dock (accessible via right-click) and in the Application View of Mission Control. To remove those and disable future additions, run the following commands in the Terminal. Note that to figure out the application's bundle identifier, you can open Activity Monitor, click the application in the list of processes and then click the “Sample Process” button. Then makes sure the “Display:” popup is set to “Sample Text”.
Output for VLC:
Sampling process 66975 for 3 seconds with 1 millisecond of run time between samples Sampling completed, processing symbols... Analysis of sampling VLC (pid 66975) every 1 millisecond Process: VLC  Path: /Applications/VLC.app/Contents/MacOS/VLC Load Address: 0x100000000 Identifier: org.videolan.vlc Version: 1.1.11 (1.1.11) Code Type: X86-64 (Native) Parent Process: launchd  [...]
VLC's application bundle identifier is thus org.videolan.vlc.
Now, to disable recent item listing for VLC, you would issue the following commands in Terminal:
defaults write org.videolan.vlc NSRecentDocumentsLimit 0 defaults delete org.videolan.vlc.LSSharedFileList RecentDocuments defaults write org.videolan.vlc.LSSharedFileList RecentDocuments -dict-add MaxAmount 0
defaults write com.apple.QuickTimePlayerX NSRecentDocumentsLimit 0 defaults delete com.apple.QuickTimePlayerX.LSSharedFileList RecentDocuments defaults write com.apple.QuickTimePlayerX.LSSharedFileList RecentDocuments -dict-add MaxAmount 0