[sharmi]

I use the zim notebook wiki. Physical Notebooks are great in that you can dump all your thoughts in it. So you can go into your next task clear headed. Unfortunately, I tend to misplace notebooks a lot.

Zim is quite flexible as in it can be used as a wiki or a to-do list. Bonus points for allowing nesting of tasks. I sync between laptops using Dropbox. I doubt it has a mobile option. This is the option closest to a notebook.

Zim or physical notebook, The most difficult thing is that we have to use the tool diligently to reap the benefits. One can often let the practice slide due to time/work pressure. If done properly, you realize how much of your cognitive processes are actually devoted to just remembering the list of things to do