I would say Libraries is the appropriate place. I don't think that data is the appropriate spot. Organization of the namespace is all jumbled, and files need to be organized.
I have to resort find to figure out where some classes are: Where are the Hydrodesktop.Database and Hydrodesktop.Configuration namespaces found? Ideally, the folders would reflect the organization of the namespaces, with a root namespace of Hydrodesktop
Question is if we want to add it in its own namespace, or add it to usercontrols. If it was in it's own namespace, then some of the code in the help tab could get moved into the core.
If it ever is a possibility of some UI part, the I think usercontrols would be fine.