I always have two with me, except the beach and snorkeling trips where I take along my trusty Canon powershot D10. My primary is my Canon T1i DSLR which is my primary camera.
Having 2 cameras p&s and dslr have been a life saver for me. Took pictures the first 15 minutes of my Seaplane tour in Roatan with my Canon d10 point and shoot as my dslr had fogged up. Had I only had my dslr I would have missed some of the best shots of flight.
Better to have it and not need it, then to need it and not have it photographically speaking of course. But then again I love photography