Update: More videos added below.
This one appeared during our second weekend of yacht-hammocking, and is well worth a watch. It's one of the first truly impressive Portal 2 trickshot videos I've seen, themed around the throwing of cubes. I love that there are people out there who see games completely differently to me. They see paths my mind would never think of. Take a look.
I think it's all the more impressive that this guy, schrobotindisguise, is doing this on a 360, really. I'd love to see what he'd be capable of with the far more effective mouse and keyboard. Also, if you've seen any similarly impressive videos, link them in the comments and I'll add them to the post.
Via AtkinsSJ and AlephAleph:
And for fun, here's the same player's speedrun of Portal 1: