Even with a quadro card, nview in W7 doesn't have the same multiple display options it has in XP. The nview setup in W7 is spanned or not spanned, which means exactly the same thing as extended or not extended in windows-speak. This is likely a windows 7 constraint since w7 supports multiple displays "natively", even with no nvidia drivers installed. Functionally I don't see a difference between spanned / extended in W7 compared to the "dual view" mode I used in XP.
Nview with Quadro in W7 does support hot keys, multiple desktops, nview right click menus, menu bars icons, etc.
Note my card is a "mid-level" quadro that supports only two displays at once. Some high end quadro cards support as many as four. I don't know what nview can do with them.