In place editing with a datepicker!
It is hosted and documented on Github and advertised on TheSingularity blog.
Tested on IE7+, Opera, Safari, Chrome and Firefox.
Hover over the following date » 05/30/2011 « and click it to enable in place editing. Use [enter] to confirm, [esc] to cancel, or pick the day from the datepicker.
$( '.editable' ).editable( {
type: 'datepicker'
} );