My first impression was that the "sheet" visual metaphor is brilliant. I'm all for physical-world-based visual metaphors when they can be implemented well, ie.

My first impression was that the "sheet" visual metaphor is brilliant. I'm all for physical-world-based visual metaphors when they can be implemented well, ie. not overly obtrusive and well balanced. In addition, if the the performance is as good as it seems in the video when multiple sheets are overlayed -- that's very impressive as well. I'm very curious how it was implemented. Previously I haven't preferred Basecamp but this new version is looking great so far.