That's an ill-defined statement. AI is a vast and diverse field: what makes one demonstration more "powerful" than another? There are definitely other projects that could be viewed as being in the same class of "powerful" as this cluster.
This is certainly an interesting paper, but it has to be viewed in the context of a large and active field.
Let's say we'll stop making broad proclamations about the global best in a field we know very little about.
Here is a reasonably approachable talk he gave about it. http://www.youtube.com/watch?v=ZmNOAtZIgIk
Thank you for sharing with me. :)
In return, I will offer you two interesting non-sequiturs, because I don't have anything topical and a non-sequitur seems like it's worth half what something germane would be.
.
Bret Victor, "Inventing on Principle." First 5 minutes are terribly boring. Give him a chance; it's 100% worth it.
.
Damian Conway, "Temporally Quaquaversal Virtual Nanomachine."
It's as funny as it sounds.