Collected links to all my Safari extensions.
Lets you use Control or Option/Alt plus number keys to switch directly to tabs (much like Firefox’s behavior). Configurable meta keys.
Adds a contextual menu item (and toolbar button) to duplicate the current tab. Choose to have tab open in foreground/background as well as positioning (after active tab, before active tab, beginning, end).
Optimize Legibility is a simple Safari extension that injects a single CSS attribute (text-rendering:optimizeLegibility) into every page. This will improve kerning and ligatures in text.
AvianSafari is a browser bar-based Twitter client. Supports all basic Twitter features!
Google Lightboxer is a Safari 5 extension that creates a Lightbox (Colorbox) slideshow on Google Images. You can simply click an image and it will load the full resolution image without taking you off the page. To temporarily disable hold the command key while clicking. The extension runs automatically, so there is no visible UI.