Today is day one of the Boston jQuery conference. It is also the place where the jQuery team announced the release of a new version of jQuery. The release, jQuery 1.4.3, is a minor point release but it comes loaded with some very nice performance improvements.
In addition, you will see that the new release of jQuery is much faster in some cases inside of your browser.
You can get all of the details from this awesome post over at the jQuery blog: http://blog.jquery.com/2010/10/16/jquery-143-released/ . Check it out.