I hadn't heard about this anywhere so I thought I would share.
I was on a support call with Microsoft last week and they had me download this tool:https://mbs.microsoft.com/customersourc ... 20analyzer
For some reason it was only on customersource, not partnersource. We couldn't get it to work in our environment, but evidently it scans your network, including AD, and tell you if your NAV 2009 install is done correctly. Maybe someone can test it out and report back.