[supenguin]

I use OneNote at work. It's the one Microsoft product I really enjoy using. It does so much and lets you organize things any which way you want. It is about as close as I've seen to digital paper.

Granted, I haven't had to do sketches in there, or any kind of OCR. I think I'd still do those on paper.

I've got one folder per project and one folder for each thing I want to learn.