I like the glossiness. Mootools does wonders doesn't it? I could recognize that you used mootools the instance I clicked the skip to content link! That is one of the best mootools implementations that I have seen yet. I love the two arrows that hide the boxes, though I would make it more obvious as to what they do and where they are.
I would never have realized it was Joomla if the above poster hadn't mentioned it. Good job with that. You couldn't tell without looking at the code. I had no idea that someone could pull that off with Joomla. I might have to take a look at Joomla again...