faceted search on the client side

Jeremy Keith's comment.

A nice set of default html/css for building html5 sites.

List of html5 related tools - mainly js libraries - that help for detection and addition of html5 features.

A neat fix to allow html5 elements to be stylable in non-HTML5 browsers.

Javascript lib for plotting data; works in IE as well as modern browsers.

Online tool to minify Javascript.

The jQuery Address plugin provides powerful deep linking capabilities and allows the creation of unique virtual addresses that can point to a website section or an application state. It enables a number of important capabilities including:

* Bookmarking in a browser or social website
* Sending links via email or instant messenger
* Finding specific content using the major search engines
* Utilizing browser history and reload buttons

Highcharts is a charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application. Highcharts currently supports line, spline, area, areaspline, column, bar, pie and scatter chart types.

RGraph is a HTML5 canvas graph library. It uses features that became available in HTML5 (specifically, the CANVAS tag) to produce a wide variety of graph types: bar chart, bi-polar chart (also known as an age frequency chart), donut chart, funnel chart, gantt chart, horizontal bar chart, LED display, line graph, odometer, pie chart, progress bar, pseudo radar chart, scatter graph and traditional radar chart.

The jQuery Cycle Plugin is a lightweight slideshow plugin. Its implementation is based on the InnerFade Plugin by Torsten Baldes, the Slideshow Plugin by Matt Oakes, and the jqShuffle Plugin by Benjamin Sterling. It supports pause-on-hover, auto-stop, auto-fit, before/after callbacks, click triggers and many transition effects. It also supports, but does not require, the Metadata Plugin and the Easing Plugin.

Vanadium is an open source client-side validation toolkit. It requires no coding. It is server technology agnostic but server-side aware. You declare your validation rules as CSS simple markup.

JS library to allow CSS to conditionally set styles based on browser support for modern features like canvas, border-radius, etc.

rounded corners using CSS & JS - progressive enhancement

a progressive-enhancement approach to AJAX

story about new Yahoo UI - JS libraries, controls, docs

Nice solution from Thierry Koblentz.