I had some issues loading certain apps until I installed silverlight I believe. I don't recall the exact issue, but my first impression was that the apps were just links to show the look and feel and then I installed a single peice of software and it all started working.
The interface issue will be addressed. I'm positive that they don't think that the mouse based interface is adequate. This was more to show developers direction and that you could have a touch based full fledge OS and to start developing for it because it's coming soon.
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