MooTools Core 1.3 Stable and MooTools More 1.3RC

Core 1.3

MooTools Core 1.3 is everything you got from 1.2 but with core pieces rewritten to make the entire framework faster and more efficient.

More: 1.3RC

MooTools More's first release candidate is also ready to download. While Core is a 'stable' release, More is in release candidate mode and we would appreciate any and all feedback you couldprovide, including bug reports.

Slick!

MooTools 1.3 Core fully implements the powerful Slick selector engine created by Valerio, Thomas, and Fabio. Slick is a beast of a selector engine and, as you would come to expect from a collaboration of MooTools Developers, Slick is extensible, compact, and powerful.

http://mootools.net/blog/2010/10/11/mootools-core-1-3-stable-and-mootools-more-1-3rc/