I posted this question in the 430 EX II thread, but thought it might generate more response in a new post.
Take a look at this:
http://www.expoimaging.net/product-detail.php?cat_id=8&product_id=15&keywords =Ray_Flash:_The_Ring_Flash_Adapter
Whattya think about this? Anyone tried one of these, and do they produce red-eye?