Mojave experiment is now available to watch at http://www.mojaveexperiment.com/. It makes for pretty good viewing, for example it's interesting to note that one of the more popular features appears to be Instant Search. It does highlight an important point about Vista and to an extent a weakness in all upcoming Microsoft OS's, lack of education. These people in the videos do not seem to know what features are actually available in Vista or how to use them.
Microsoft should consider releasing a Power Pack for XP that introduces some of the vista functionality. The people need to feel like Vista is familiar because they've seen some of what it can do already on their XP machine. They have a fantastic marketing tool as long as it's used correctly. People will not embrace Windows 7 if they do not understand it in the same way as they haven't embraced Vista because they don't understand it.