There are semi-colons missing in two places that I found that make it so you can not pack this script.

First is around line 805 at the end of the checkLiteral function.

Second is around line 851 after var date = new Date(year, month - 1, day)

When you attempt to include a build of jQuery UI that was downloaded with only the 'Tabs' option selected from ui.jquery.com (after jQuery has been included, of course), this error is given in Firefox 2.0.0.9 / Windows:

(From Firebug)

$.ui[w] has no properties
http://[domainname]/scripts/jquery.ui.js
Line 8

After the error, no jQuery UI functionality appears to work in any browser and $(foo).tabs() reports that it is not a function.

If, when downloading the build, "Draggables" and "Droppables" are selected, everything works as expected, except with a considerable file size increase.

The following code should call the callback function stopDrag but it doesn't.

$("ul.reorder").sortable({stop: stopDrag});
function stopDrag(e,ui) { alert("updated");}

add the following line at line 190 of ui.sortable.js

$(this.element).triggerHandler("sortstop", [e, that.prepareCallbackObj(this)], o.stop);

and it works