"PhantomJS is a headless WebKit with JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG."

"It's a debugger for web pages, like FireBug (for FireFox) and Web Inspector (for WebKit-based browsers), except it's designed to work remotely, and in particular, to allow you debug web pages on a mobile device such as a phone." Blimey. That's, um, remarkably useful. Duly noted.

Web Inspector gets an overhaul; it's looking pretty nice, now.

"The mouse is a continuous pointing device; the finger is discontinuous. That’s a profound difference that I wish I were able to clearly understand and explain." PPK on how MobileSafari responds to Javascript's mouse actions.

"Plainview is a full-screen web browser." Simple, Webkit, and effective. Useful if you need a kiosk-mode Safari in a hurry.

"Fluid gives any webapp a home on your Mac OS X desktop complete with Dock icon, standard menu bar, and logical separation from your other web browsing activity." A nice way to build site-specific browsers; shame it's Leopard-only...

"GreaseKit is successor of Creammonkey. This software adds Greasemonkey-like user scripting to Safari, Mailplane, Diet Pibb.app and all WebKit applications." Looks good.

It is poor coding to access style/layout information repeatedly during the loading cycle of a page, because in order for the engine to supply you with an answer, it has to ensure that its layout and style are up to date.