Multiple Service Tiers – NAV 2009 SP1
Freddy have update his blog about how to run multiple service tiers in NAV 2009 SP1. One of the new things in SP1 is that you can use named instance of SQL server. On the blog post he has some nice bat script that can set everything up.
The post can be found here http://blogs.msdn.com/freddyk/archive/2009/08/05/multiple-service-tiers-sp1.aspx