These are not my ideas, but the work of Jamie, a member of Channel9, Microsoft's community website.
These are raw, just meant to show some interesting concepts in how the Windows Vienna desktop can be structured:
Switching between windows would go in a circle:

Opening a picture:

Hovering a picture:

In place of the start menu:

I like all these, especially the picture showing without any frames, just with a shadow and all the controls popping up when you put your mouse over it.
Remember, these are just raw sketches.