Daniel Saxil-Nielsen has a nice Scriptaculous tutorial showing off Effect.ScrollTo(). Short and sweet  tutorial that will give you a nice little effect to add to your toolbox.

Jacob Moon writes on the Google Code Blog about how they increased performance on http://code.google.com. Tips include combining/minifying your JavaScript and CSS and using CSS sprites for often used images. This is a good article outlining steps taken to performance tune a high-traffic website in the real world.