Resets some defaults in Lion, namely clearing the Launchpad, enabling Key Repeat and showing the user Library folder

sane_lion_defaults.sh

# Clear applications listed in Launchpad
sqlite3 ~/Library/Application\ Support/Dock/*.db "DELETE from apps; \
  DELETE from groups WHERE title<>''; DELETE from items WHERE rowid>2;" \
  && killall Dock

# Enable Key Repeat
defaults write -g ApplePressAndHoldEnabled -bool false

# Show the ~/Library folder
chflags nohidden ~/Library