Private protection, public share
Some notes are not meant for other eyes. An encrypted analog notebook is not yet invented, and if you want to protect his lyrics and comments really sure you do not come around a digital encryption. On the iPad there is some protection available.
If you would like to share with other texts, or even work together, then notebooks are a bad choice. Of course you can copy the pages, but for the digital collaborative text editing, and editing the same text on different devices, there are no suitable analog counterpart. Also copies in the sense of security copies are to be similarly difficult.
Lack of versioning capabilities are another shortcoming of analog companion. If you want to track the work on a longer text or make major changes to undo, you can not reproduce this in a notebook handy.
Ipad Video Lessons
The digital calendar
Calendar and reminder functions that can be implemented in analog calendars only with self-discipline to go out on the iPad slight of hand. V.a. one must note the birthdays every year, not new to the calendar, and also the power to share calendars with others is only possible digitally.
All the functions that are only conceivable in the digital space (blogging, photos, Twitter, Wikipedia, Google, etc.), one misses the other hand, rarely in typical notebook work.
The combination makes it
For me, my notebook is still indispensable, but complete notebook and iPad are great, what you also to the many possible combinations of the two looks. Text notes and diary entries, keywords in a meeting or on the road to go with a notebook easier by hand.