I use a sketchbook for any development and design sketches, as well as meeting notes and information from conversations.

I try not to bring my computer to meetings so I'm not distracted. I prefer to write things down with pencil because I'm the type of person who needs to erase things all the time, and by crossing things out with pen, things get messy, and my OCD flares up.

For everything else, I keep my life in a variety org org-mode files.