In jQuery 1.8, animation of skew and translate are broken. (Animation of scale seems to work, however.)
Setting by $(selector).css({skewY: '10deg'}) works, but animating by $(selector).animate({skewY: '10deg'}) causes the following error:
jquery-1.8.2.js:583 TypeError: 'undefined' is not an object (evaluating 'obj.length')
This appears to then kill the animation queue, as subsequent animations to that element don't fire.
jsFiddle reduced case of broken skew animation:
http://jsfiddle.net/richcon/UkAfD/