Did you know that the YUI Team tweets regularly under the handle @yuilibrary?

You can also follow some team members directly: @allenr, @ls_n, @yaypie, @tilomitra, @reid and @davglass.

YUI 3 is Yahoo!'s next-generation JavaScript and CSS library. It powers the new Yahoo! homepage, Yahoo! Mail, and many other Yahoo! sites. The YUI 3 Library has been redesigned and rewritten from the ground up incorporating what we've learned in five years of dedicated library development. The library includes the core components, a full suite of utilities, the Widget Infrastructure, a growing collection of widgets, CSS resources, and tools.