Why is Stephen entirely silent?
Comfortable chair?
The data binding stuff is nifty, though I wish you had just built it as jQuery plugins instead.
jQuery 1.4 has $.require - http://docs.jquery.com/JQuery_1.4_Roadmap - and should be out before year's end.
Where jQuery really needs help is the UI stuff. Ext, YUI, Dojo, ..., all have better widget frameworks than jQuery UI. Ext in particular just looks so much better than all of the other stuff. It's no wonder that Adobe (AIR) and Google (GWT) jumped on the Ext bandwagon.