“As you can see, you can do some pretty bad things with JavaScript that will certainly drive your visitors away (or insane!). So why is this kind of functionality available? Some functions is actually very useful if you’re writing complex HTML5 web applications. By disabling text-selection on interface elements you can make the application easier to use, and you can re-implement the right click menu using your own options.”

A JavaScript that navigates a Facebook fan page and outputs all of the fans into a CSV file. Incredibly useful.

Sounds stupid and listy but it's actually a good introduction to some of the more useful and practical pieces of the huge insane HTML5 Boilerplate (html5boilerplate.com).

Total linkbait I know but there's some useful stuff here.

"Raphaël is a small JavaScript library that should simplify your work with vector graphics on the web. If you want to create your own specific chart or image crop and rotate widget, for example, you can achieve it simply and easily with this library."

A good edit-in-place plugin for jQuery.

This bookmarklet makes reading things on the web very simple and thus enjoyable by removing all of the often-useless and often-flashing worthlessness surrounding the content.

As seen on Normative.com.

As seen on Normative.com.

This could be good. "Cufón aims to become a worthy alternative to sIFR, which despite its merits still remains painfully tricky to set up and use. To achieve this ambitious goal the following requirements were set: No plug-ins required; it has work on every major browser on the market; no or near-zero configuration needed for standard use cases; it has to be fast, even for sufficiently large amounts of text. And now, after nearly a year of planning and research we believe that these requirements have been met."

Hide an email address from spammers with Javascript-powered character encoding. Sweet.

"JavaScript Regex Tester." Put in your test data and your regular expression and see if it works.

Ugly "Browse..." buttons be gone!

"the little JavaScript and CSS bundle I've been working on that makes developing iPhone web apps easy."

Incredibly awesome. Ahhh!