Check the checkbox at the bottom of Desktop & Screen-Saver in System Preferences.
defaults write com.apple.dock no-glass -boolean YES
They make the performance of Samba/CIFS file transfers really slow.
echo "$x" | sudo tee -a /etc/sysctl.conf
sudo chown root:wheel /etc/sysctl.conf
sudo chmod 0644 /etc/sysctl.conf
sudo sysctl -w "$x"
Not really an OS X thing, but whatever…
defaults write com.apple.iTunes show-store-arrow-links -bool FALSE
defaults write com.apple.itunes show-genre-when-browsing -bool FALSE
System Preferences → Hardware → Keyboard & Mouse → Keyboard Shortcuts → Keyboard Navigation → Move between controls or text boxes and lists
This enabled you to tab between all buttons in windows. Detailed instructions courtesy of Mathias Bruce, thanks!
sudo defaults write \