I'd posted this at the tail end of the last such thread, but it's well down the list now. A small site I designed and developed, launched last week:
http://www.shoshintech.com/ Uses jQuery for the navigation, adding the "Print this page" link next to the breadcrumb (since it relies on javascript), and automatically closing any popup window when leaving the given parent page or opening a new popup window (see the About Us / Location page). Nothing groundbreaking, but there it is. Have another site in client review that uses jQuery for some other things... Kevin