Havron’s First Law of Personal Information Management: Use Tools You Love to Use. Then you have half a chance of actually keeping up with it.
From @annahavron: Analog Office - Keep a Canonical Address Book
@toddgrotenhuis thanks for the mention! looks around, whispers there's some blah-blah-budget-blah-blah in the fine print, but it's been awhile since I read it...