Inline CSS Editing

This is the biggest new feature of the Inspector. You can now edit CSS styles simply by double-clicking them in the Inspector’s Styles sidebar. This is really handy for tweaking the look of your site live in the browser.

It’s referred to again in the Safari 3.1 release notes, but I can’t get it to work in the final downloaded version, though it still works in the WebKit nightlies. Perhaps the feature was deemed yet too unpolished for official release — there are still a lot of bugs reported on it, and FireBug’s CSS editor is arguably better (and MacRabbit’s CSSEdit even more so!).

P.S.: The future of the Web Inspector looks even better.