Microsoft Dynamics GP 2010 Service Pack 3 has been release. As usual, Developing for Dynamics GP has more details and links than you ever wanted to know about.
Microsoft Dynamics GP 2010 Service Pack 3 – Developing for Dynamics GP – Site Home – MSDN Blogs
Install, Upgrade & AdminMicrosoft & the GP EcosystemGP 2010
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.