For a calendar, I have pasted a month per sheet into the back of my
Moleskine, going backwards (i.e., December, November, October, etc).  For
quick jotting of contacts (and important numbers like license plates and
insurance account numbers), I left about five or six pages blank at the very
end.  

    In the front I have a weekly calendar that folds over and fits in the
Moleskine.  It has seven days, 8am to 6pm (on which I list evening activities
and sometimes dinner).  It also has room for action items, room for notes and
a long strip down the side which I use for project lists.  One back I use for
shopping lists.  I print out a new one and do a weekly review (semi-GTDish)
each week and transfer over unfinished items and review the items on my
monthly calendar pasted into my Moleskine.  During the day I manually draw
Marcus-Bains lines and slash across the past as the day slips away.  That
also gives me a clue as to how often I'm reviewing tasks.  

    When I'm out the only contact information I ever use is phone number,
which I have on my phone.  If I need an email address or physical address, I
am in front of my laptop sending email (or mailing something from the desk
next to the laptop).  What contact information do you use on the road (not
counting collection)?

    I'm not trying to 'convert' you at all (reading back, it could be
interpreted as that), just explaining why I work the way I do and wondering
what you do differently or why you chose to do it the way you do.