You can change the Safari progress bar from the “classic” location bar filled from left to right to a pie chart progress indicator like this one:

Safari Custom Progress Bar

This trick only works on Safari 3 beta.

Open terminal in Applications>Utilities and type (or copy/paste):
defaults write com.apple.Safari DebugUsePieProgressIndicator -bool true

If you want to revert to the old progress bar, go to terminal once again and type:
defaults delete com.apple.Safari DebugUsePieProgressIndicator

Posted in Macintosh Tips & Help, Safari