Along with an update of Safari to version 5.0.1, Apple introduced the long-awaited Safari Extensions Gallery with a few dozen certified extensions.
Extensions are a great way for you to add new features to Safari 5.0.1. Built by developers, Safari Extensions use the latest HTML5, CSS3, and JavaScript web technologies. And they’re digitally signed and sandboxed for improved security. You can install extensions with one click — no need to restart Safari.
It’s not even a download. Simply visit the Gallery, select an extension, click the Install Now button, and you’re done. My favorite is Daring Fireball with Comments.