My principle use is as follows. There is a small set of notebooks on the topics "Work", "Accesses", "Dump", "Recipes" and a few more. A very broad and global topics. Then using tag I break more deeply. Ie, for example, now I work on a new project to create a website for the company "Vasya Pupkin to", I make CLEAR to ME the tag and all the records on this project go to the Notepad, "Work" tag of the project. And if it is a letter from the hosting provider for this site, he goes into the category of "Access" with the same tag of the project. I hope the analogy and thought process clear. The main thing is to give obvious names for yourself name. Then you can make a selection on the topic (Notebooks) or for a specific logical entities (Daegu). IMHO.