Switching tabs in Safari 4 with shortcuts, just like in Firefox
As a heavy-user of Firefox, the biggest annoyance in Safari for me was the missing shortcuts for directly accessing tabs. In Firefox you can access the tabs by pressing Cmd+<number of tab>. For example, if you want to jump to your third tab you would press Cmd + 3 (⌘ + 3), however in Safari this loads the third bookmark from the bookmark toolbar - very annoying if you are used to a different behavior.
Luckily there is a way to change this behavior and make Safari (4, not sure about 3) behave like Firefox with the help of this innocent looking piece of AppleScript: