Stuff I Liked or Use

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Make hidden applications appear translucent in the dock

defaults write com.apple.Dock showhidden -bool YES
killall DOCK

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Verbose boot every time:

sudo nvram boot-args="-v"

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Single-user mode http://support.apple.com/kb/HT1492

command-s at boot

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Disable startup chime:
Create a file, /etc/rc.shutdown.local, with the following contents.

/usr/sbin/nvram SystemAudioVolume=%80

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Change Network settings – networksetup. e.g.:

sudo networksetup -getproxybypassdomains AirPort

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Display full paths in Finder windows (requires 10.5)

defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES
killall Finder