In OS X 10.5, you can display full directory paths in Finders windows instead of standard directory names.
Just execute these commands in the Terminal to change this behaviour (this will restart the finder!):
defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES
If you want to revert the change, execute these commands:
defaults write com.apple.finder _FXShowPosixPathInTitle -bool NO