The bumptop one just irritates me every time I see it. I don't know why - but you may have hit on it in your comment; other than how to organise files, it shows you very little else. Perhaps because they haven't thought the idea through to anything more useful, such as how to actually get some work done on it, rather than spending all day throwing files around the desktop.
The sphere one, just looks like a virtual desktop which wraps around at the edges, and to make the name fit, let's make it look curved and pat ourselves on the back for being clever and original.
The touch screen one, though, I noticed a couple of things which I did think were quite good: specifically, re-sizing and scrolling/rotating. To shrink an image, the screen was touched in two places on that image and the fingers squeezed together (and the reverse to expand it). A similar technique for scrolling and rotating - touch a point, drag your finger(s) around and the document is scrolled or rotated. That worked because it's like you're saying "I want this bit (points) to be here and that bit (points) over there."
The only thing was, when it was all pretty patterns near the start, I couldn't help but think of Jean Michel Jarre performing one of the Rendezvous tracks with the laser harp.