BoxOver
http://boxover.swazz.org/
(Needed to scroll down the page a little)
Taggify
Taggify is a web widget which allows bloggers and publishers enhance their sites by adding visual tags to any site’s images. Visual tag is a clickable image region tagged with some title, description and link. When visitor moves mouse over such region Taggify shows popup tooltip with interesting content provided by the publisher.
