proper naming convention for plugin solution and class library?

Hello - I need to set up a new solution for CRM 2011 plugins. What kind of structure do you normally use for this? For example, do you use the following naming convention for the solution itself?:

MyCompany.MyDivision.MyProduct.Plugins

The solution will have several class libraries, including the main class library used for the plugin classes. So it seems like the actual plugin class library should have a namespace like:

MyCompany.MyDivision.MyProduct.Plugins

However, is it valid or considered ok form to have a class library with the same namespace name as the parent solution? How do you normally handle this?