As of jQuery 1.4 you can pass attributes to a self-closed element like so:
jQuery('<div>', {
id: 'some-id',
class: 'some-class some-other-class',
title: 'now this div has a title!'
}).appendTo('#mySelector');
Here it is in the Docs
Examples can be found at jQuery 1.4 Released: The 15 New Features you Must Know .