[jp_d]

Bullet journal looks interesting...

It's a system on how to write down notes/tasks/events in a notebook. It let's you refer back to your notes easily.

http://bulletjournal.com/

[radix07]

This is the way to go. I use a small Bullet Journal that I can carry in my pocket every day. I found Field Notes were expensive, so I use a Fold Journal (http://www.foldjournal.com). They are similar, have dot grid paper, and are way cheaper.