Going through the Jquery 1.2 release notes using IE6 I couldn't even access the page on Ajax. Everytime I clicked the Ajax Link, the browser folded like a house of cards.
A second problem exists under clone(true) found in the Manipulation link. The documentation indicates that each cloned button will itself be clonable. However, in IE6, the only button that produces another clone is the first "Clone Me!" button. Any subsequent button-clone does nothing when clicked.