I'll admit I also use my notebook very heavily, but usually only for personal notes.
When I write my notes for a specific task, I'll use the computer. Also, there is a possibility that I have to share those documents with my co-workers. In that case, I always use Emacs with org-mode.
My documents include:
Emacs is just a text editor (on steroids) and org mode a plug in. (we call those packages)
So my files are just plain text, which I love, because I grep the hell out of them.
(where did I use that library already? ... grep... haaa, during that project!)
org-mode can export into PDF or HTML.
I use HTML extensively.