If you need info about registering plug-ins in for CRM 2011, read my latest article on Using the Plug-in Registration Tool for Microsoft Dynamics CRM 2011. This article is written for developers interested in registering custom plug-ins or custom workflow activities with Microsoft Dynamics CRM, or system administrators who need to manage registered plug-ins.
This article complements the documentation in the Microsoft Dynamics CRM SDK by providing detailed information on how to use the Plug-in Registration tool to register custom code with Microsoft Dynamics CRM 2011 and Microsoft Dynamics CRM Online. Additionally, it contains links to relevant information in the SDK.