Make sure that checked state is cloned properly. Based upon the patch by Michael, required better test cases and in doing so found more edge cases. Introduced a new check into jQuery.support as a result. Fixes #5929.

Make sure that it's possible to preventDefault natively-triggered (submit, focus, blur, click) events. Fixes #5695.

Use alternative technique for triggering an abort, preventing an exception from being thrown in Firefox. Fixes #5923.

Expose cleanData, make sure that all bound event handlers are properly cleaned up after html/empty/remove. Fixes #5856 and #5906.

Make empty strings (and other non-string values) simply return null from parseJSON. Also added some parseJSON tests. Fixes #5859.

fixed offset(coordinates) returns null when no matching elements in jQuery object (fixes ticket #5888)

fixed jQuery.dir regression introduced with 1.4 *untils patch that errored when traversing XHTML text nodes with an until test

Added support for multiple live event handlers, live hover, and live focus/blur (mapped to focusin/focusout). Fixes #5804, #5801, #5852.

Adding in the change recommended by Alexander Farkas to fix some bugs in the change delegation logic. Fixes #5851.

Make sure regular settings object is set as context for all Ajax requests, if none is specified. Fixes #5838.

Expose the proxy object on the object, for the benefit of plugin authors (Thanks to Justin Meyer for the suggestion).