"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.

"I've come up with a plugin that you can inject into a jQuery site that you own and see how the performance breaks down method-by-method." Once again, John is awesome.

Useful for work, at least.