Classic or new styled tabs can be get by entering the following command in a terminal window:
CODE
defaults write com.apple.Safari DebugSafari4TabBarIsOnTop -bool [TRUE/FALSE]
And Google is your friend
QUOTE (LuvMac @ Jun 8 2009, 09:21 PM)

I want the blue loading line back

Any ideas how to do that ?

Here's how to change the progress bar, enter the following command in a terminal window:
CODE
defaults write com.apple.Safari DebugSafari4IncludeToolbarRedesign -bool FALSE
defaults write com.apple.Safari DebugSafari4LoadProgressStyle -bool FALSE
QUOTE (Rickylex @ Jun 8 2009, 09:37 PM)

Remember people, Safari 4 Final is for 10.5.7+
You obviously missed the release notes and the WWDC keynote because it even works with Tiger like djmastera2000 said with the security updates.