We have released the source files for Dynamics NAV 2009 SP1 Help to PartnerSource. This release includes 8 different languages across 16 countries/regions, approximately 1 million files, and about 2.5 GB of content. If it were in book format, that would stack up to about 10 meters of books. That's a lot of help for a lot of users!
With these source files and the previously released Help Toolkit for SP1 (also on PartnerSource), you can modify the Help files to match customizations that you create. Go ahead, add to the stack of content and customize the Help that you provide to your users!
And as always, let us know what you think about the Help, the customization process, the tools, what's missing, and what would be more helpful.