MSDynamicsWorld has a great article up looking at how Upcoming Certification Changes will Realign VAR Ecosystem. Resellers of Dynamics GP have a number of changes coming to the way they will interact with Microsoft and the article does a great job of parsing how these changes will affect large and small resellers.
Microsoft Dynamics Partner Gut Check: Upcoming Certification Changes Realign VAR Ecosystem
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.