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Simple answer is Yes, Norton Internet Security 2008 is compatible with Vista 64-bit versions. Because others have asked in the past, and to avoid possible follow-up questions, it is NOT compatible with Windows XP 64-bit.
While NIS 2008 is compatible with Vista x64, it does lack some features from it's x86 counterpart:
No right click scanning
No self protection
No suspicious activity monitoring or its advanced mode
No transaction protection (crimeware)
These are the only ones I have noticed so far so there may be others. Hopefully this will be rectified in 2009 as more and more people switch to 64 bit computing. Computer companies such as Dell are even now offering x64 based systems.