A trick I found in Mac OS X hints, and the web inspector is superb (iPhoto style):

Safari Inspector


It’s a single line to copy (type) in the terminal after quitting Safari:

defaults write com.apple.Safari WebKitDeveloperExtras -bool true

Restart Safari and you’ll find a new item “Inspect Element” in the contextual menu (that appears when you control + click somewhere on a page).

Posted in Macintosh Tips & Help, Safari