[jQuery] [jEditable] select editinplace has empty pulldown

I'm trying to set up some <select> form elements for in-place editing
using jEditable, but in every case the pulldown is always empty.
Firebug doesn't reports any errors or problems.

As far as I can tell, I'm doing this according to the documentation at
the jEditable site. Is this me again?

Test case at http://apache.pastebin.ca/1271389
Content-type is application/xhtml+xml;charset=UTF-8, but it doesn't
seem to make a difference if I change it to text/html.