A very interesting whitepaper has been released on Partnersource: Developing Solutions for Microsoft Dynamics NAV 6.0.

It describes in detail the changed in Dynamics-NAV 6.0:

• Architectural changes from a two- to a three-tier architecture, including a discussion of the new RoleTailored client and Microsoft Dynamics NAV Server with Web services support.
• Development improvements and benefits for Microsoft Dynamics-NAV 6.0, including the introduction of the new Page Designer, changes in Object Designer, and enhanced reporting using SQL Server Reporting Services.
• Functionality that needs to be redesigned from a previous version to work in Microsoft Dynamics-NAV 6.0.
• Step-by-step walkthroughs that demonstrate new development features, including creating and modifying pages and creating a report.
• Appendix with a list of elements that have changed in the three-tier architecture.