I also maintain two logbooks. I have a large paper logbook and LogBook Pro electronic logbook. I really like LogBook Pro because it is so easy to extract any data needed for an application. The other great thing about LogBook Pro is their Iphone App. At the end my duty day I open the App on my Iphone and punch in my flight times and it automatically syncs to my PC. When I get home that days flights are already in my electronic log book. Every month or so I back log from my electronic logbook to my paper logbook and put it back in the safe. I may one day stop the paper log book but there is something about the paper logbook I personally enjoy.