So judging by resonse so far, I am alone is using multiple to-do programs/applications? I'm a little surprised at that. I was expecting others adopt similar approach as me (multiple to-do programs) because there is no one perfect to-do app for all purposes... each has it's strength and area where it makes sense.
Re: Evernote - that is my next planned topic - "how many apps do you use to capture information in your life". My sense is I have the right number of to-do apps to suit my own personal style and work effectively, but way too many different ways to capture info, so finding info when I need it is not so straightforward.