We've built virtual appliances in OVF format for those who want to get quickly started with NAV. Most popular virtualization environments can import this appliance (Though you may need to use VMWare's OVFTool to import it properly into VMWare).
The appliances are usually built on 64-bit stable versions of Debian GNU/Linux, with NAV installed from the packages available at our APT repository (see nav_on_debian). This also means that NAV is easily upgradeable using Debian's aptitude or apt-get tools.
Stable releases are found in the stable directory, beta testing releases in the beta directory. Kinda obvious, isn't it?
navrocksto something else (using passwd)