I just read the announcement in jQuery Blog that jQuery 1.6 is now available for download!
This release contains major rewrite of the Attribute module and a number of performance improvements…
You can get the code from the jQuery CDN:
You already have it available in Microsoft Ajax CDN - http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.min.js
In the following link http://api.jquery.com/category/version/1.6/ you can find all the aspects of the API that were added, or had a new signature added, in the corresponding jQuery version.
You can read more about this on the following link: http://blog.jquery.com/2011/05/03/jquery-16-released/