Locking screen under Snow Leopard

Long time ago I got this figured out already once:
- either set "Show taskbar icon" in Keychain Access' preferences where there is a lock option
- or drag ScreenSaverEngine.app to the dock to be able to start expilictly

from http://www.infinityandbeyond.tabert.com/posts/2009/09/lock-screen-quickly-in-os-x-snow-leopard

iTunes 10 song link redirection

To redirect links next to songs to iTunes Library instead of iTunes store:
defaults write com.apple.iTunes invertStoreLinks -bool YES
to restore
defaults write com.apple.iTunes invertStoreLinks -bool No

To disable links completely:
defaults write com.apple.iTunes show-store-arrow-links -bool FALSE
re-enable:
defaults write com.apple.iTunes show-store-arrow-links -bool TRUE

via beszeljukmac