I'm a big believer in pen and paper. I like apps just fine, but I'm a fan of having personal stationary - it makes me that much more likely to actually follow up with kind words and thanks. And a great pen is just as important.
If you're interested in fountains pens or simply want to know more about the history of the tool, this Art of Manliness post is for you. Uni-ball pens were my personal go-to for much of my life, but I'm interested in branching into the fountain pen realm.