I'd like the ability to link to a notebook as well. In my case, I want to set up closer integration between EN and my GTD system (DoIt.im). For each project in DoIt, I have an associated EN notebook containing reference materials for that project. I want to be able to put a link in the project's description that will take me to the relevant notebook in EN; right now I can put in a note link but that's not ideal as I want to go straight to the notebook, not a particular note.