I like how when you click Reply to a comment on David Walsh's site the comment form breaks away from the bottom and goes off to the side, pointing at the comment you are replying to.
If you're gonna make a ribbon, make a ribbon. Also love the multiple layered borders.
Go check out the live site, the waves flow back and forth and the sun glare follows the mouse.
Extra three dimensional feeling.
I like all the calls-to-action (and how they literally call them out as such) at the bottom of reading a post on Boagworld.