Just to follow up on this, looks like the RC1 version of 1.4 is close... really close :-)
Damn IE6 !! From: http://twitter.com/jeresig # Grrr, phantom bug popped up in IE 6 just as I was about to push 1.4rc1 live. # Need sleep in order to fight, 1.4rc1 tomorrow. # - about 11 hours ago from web