The newest version jQuery 1.1.3 has just been released.

The latest version has an improved selector speed with an average of 867% improvement. Animation speeds has also been improved. It also fixes over 80+ bugs from the previous 1.1.2 version. Additional functionalities were also included, namely the addition and support for unicode selectors, and the inequality selector. And the best of it all is that the library is still 20kb in size. The jQuery 1.1.3 release is a must-have download for increasing the speed performance of jQuery.

You can download the latest version here:
jQuery Download Page