Check out http://forrestcroce.com. It's using a three-tiered dropline menu which is a style variant of Joel Birch's Superfish menu. It's styled for the child menus to "step down" from the parent with space between to give a see-through effect without transparency (except in IE6, but it works there nonetheless).
Joel, you said on your page you check here periodically, and I wanted you to see this. I'm hoping to spread the word on your creation, because I hope that this is the direction many menus will take in the future.
