I'm having a similar problem with the href=# in the datepicker. I
have an ajax application that uses the #hash for application state,
much like many other ajax apps out now. My app watches for changes to
the hash and loads the resource described in the hash, but the
datepicker--as well as the close button on the dialog--causes the app
to error. I've changed these anchors to use javascript:void(0) as
well, but as Ajaxy sites that use the hash for history and bookmarking
become more popular, using href=# is going to become more of an issue.
Mike