Glims for Safari is a input-manager hack (I think) that enables a few ‘nice to have’ features. First, it adds favicons to tabs. I am not sure about you, but the new tabs (when you have a lot of them) are really hard to tell one from another. This helps. It also does things like add thumbnails to search results and makes the search history/recommendations look like Inquisitor a bit.

I might give this a spin.

Source: Glims for Safari.
Via: Shaun Inman.

Both Pierre Igot and John Gruber cover this topic in great detail; the fact that the first user interaction with Safari’s tabs while dragging ultimately determine their ability to either reorder the tab and/or open a new window/tab. But that’s generalizing it far too much.

If you’re an anal Safari nut, like me, I suggest you read both of their articles.

Source: Safari 3.0: Dragging tabs up or down to move them sideways.
Secondary, source: Safari’s Tab Dragging Modes.