Most of the times I'm at a lack for words to describe something, it's because it's something incredibly absurd or stupid. Here, it's because THIS IS SO DAMN RAD!
Stop whatever you are doing. Go watch the video of this, right now. I don't care how important what your doing is... Watch this video, right fucking now.
You are about to see the best thing thats happened to the GUI since the pixel.
Update: Ok.. So only people who litter their desktop seem to think this is as cool as I do. We are apparently a fringe minority. To those like myself, this is fetish UI porn. I currently have 68 files and folders (no app launch shortcuts) on my desktop. I would _love_ this.
[ I fall into the presumed majority of non-messy desktop users -- i have one file on my desktop and it's a temp folder that holds things for a little while until i can properly file them.
That being said, part of my meticulousness may stem from the fact that file manipulation *is* so much less convenient on computer screens. The methodology is a pain, and so i keep things hierarchical.
A lot of it is aesthetic however... my real actual desk is meticulous as well. I have a stack of scrap paper for writing, and individual piles or folders specific to individual tasks or projects, but only if they're active. If i'm not working on them now (within a few days margin), they get filed into medium term (a folder stand on one corner of the desk) or long term (a pile of folders in my cabinet).
If my desk (or desktop) is messy looking it's because i'm working on only one project and it's really taking 100% of my time. Otherwise the overhead of finding information overwhelms my ability to focus on the task and i get nonproductive. My computer desktop reflects the same mode. For me, random stacks and piles aren't an organization technique, but a way to demolish all productivity.
I do like the metaphor of displaying information on relevance, importance, etc by icon size, weight, orientation and so on. That's worth quite a bit.
I'd like to see them adapt that interface to permit mouse use (since people aren't gonna change to a pen interface anytime soon) and build a tie in to MacOS. They also need to add labels. Preferably fadable ones, but each file/window/page and each stack or group needs to be able to show a label, so when I mouse over it I know which stack it is (e.g. "My Travel Plans, or "Data Migration Project". Give me those and I'd try it out.