Welcome Brian Roney from the GP developer team and his new post Dynamics GP Developer Insights: Introduction. They’ve got new videos coming looking at developing around the GP web client so pay attention!
Dynamics GP Developer Insights: Introduction – Developing for Dynamics GP – Site Home – MSDN Blogs
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.